Vice President JD Vance was supposed to be airborne Tuesday morning, headed for Islamabad to lead the highest-stakes diplomatic mission of the Trump administration. Instead he stayed at the White House, his travel plans scrapped at the last minute, as Iran signaled it has no intention of showing up to the table, and President Trump warned that bombs could follow.

The ceasefire between the United States and Iran expires Wednesday at 8 p.m. ET. As of Tuesday, fewer than 24 hours remained on the clock, and the two sides appeared no closer to a deal than when the two-week truce began. Senior White House officials gathered alongside Vance to chart a path forward, the Daily Mail reported, even as the diplomatic architecture built around a proposed Islamabad summit threatened to collapse.

Trump, speaking to CNBC on Tuesday morning, left little ambiguity about what comes next if Tehran refuses to engage. He said he "expects to be bombing Iran" and that "the military is raring to go." He added a pointed invitation alongside the threat.

"We don't have much time [to get a deal]... Iran can make themselves into a strong nation again if they make a deal."

That mix of carrot and stick has defined the administration's approach since Trump first threatened military action earlier this month, then pulled back and agreed to a temporary ceasefire instead. The president has now said he does not want to extend the truce. If it lapses Wednesday evening, Trump vowed, "lots of bombs start going off."

Iran digs in as Pakistan scrambles

The immediate obstacle is Tehran's refusal to confirm it will send representatives to the proposed summit. Pakistan's Information Minister Attaullah Tarar said his government had made "sincere efforts to convince" Iran to attend, but acknowledged that Tehran had not made a decision to meet with the United States.

Pakistan's foreign minister went further, urging both Washington and Tehran to consider extending the ceasefire by another two weeks, a request that would buy time but that Trump has already rejected. The appeal amounted to an acknowledgment that the talks Pakistan hoped to host may not happen at all.

Iran's own statements have been more blunt. The Iran Foreign Ministry publicly declared it had "no plans for the next round of negotiations." And Iran's parliament speaker, Mohammed-Bagher Ghalibaf, posted on X that the regime was "prepared" to renew fighting against U.S.-Israel forces in the Middle East.

"We do not accept negotiations under the shadow of threats, and in the past two weeks, we have prepared to reveal new cards on the battlefield."

That language, "new cards on the battlefield", is the kind of rhetoric that tends to harden positions rather than open doors. It also suggests Tehran spent the ceasefire period preparing for renewed hostilities rather than laying groundwork for a deal.

Vance's expanding role, and its limits

The vice president's assignment to lead the Iran negotiations marked one of the most significant foreign-policy responsibilities Trump has delegated to Vance. The president personally tasked Vance with trying to secure a resolution, AP News reported, pairing him with special envoy Steve Witkoff and Jared Kushner for the Islamabad talks.

It was a role that fit a broader pattern. Trump has increasingly leaned on Vance for high-profile assignments, from his appointment as the administration's "Fraud Czar" to legislative fights where Vance's tie-breaking vote carries real weight.

Before the trip was shelved, Vance struck a tone that balanced optimism with a clear warning. He told reporters he believed the talks would be "positive" but drew a firm line, as Just The News reported.

"If the Iranians are willing to negotiate in good faith, we're certainly willing to extend the open hand. If they're gonna try and play us, then they're gonna find that the negotiating team is not that receptive."

Trump himself underscored the stakes with characteristic directness. "The only reason they are alive today is to negotiate!" he wrote about Iranian officials, the New York Post reported.

The administration made clear the ceasefire itself was conditional: it required the free, safe, and immediate reopening of the Strait of Hormuz without limitation, including tolls, Breitbart reported. White House press secretary Karoline Leavitt confirmed the negotiating team's composition, Vance, Witkoff, and Kushner, with talks originally set to begin Saturday morning local time in Islamabad.

The Strait of Hormuz and the pressure campaign

At the center of the standoff sits the Strait of Hormuz, the narrow waterway through which one-fifth of global oil trade passes. Trump imposed a naval blockade after Tehran refused to suspend its nuclear program. In recent days, U.S. forces have escalated that pressure, boarding and seizing tankers destined for Iranian ports.

The blockade was designed to force Tehran back to the table after initial Vance-led negotiations collapsed. It has worked, as leverage. But it has also carried costs. Global oil markets have remained volatile as the conflict entered its 53rd day. U.S. gas prices climbed above $4 per gallon on average, a figure that hits working families hardest and gives the administration a domestic incentive to resolve the crisis quickly.

Vance has also been visible on other fronts where the administration has clashed with international institutions, including a pointed exchange with the Vatican that showed the vice president's willingness to take confrontational positions on behalf of the White House.

The Hormuz blockade, however, is a different order of magnitude. It is the kind of pressure tool that can bring an adversary to the table or push both sides past the point of return. Iran's public posture, rejecting talks, threatening "new cards", suggests Tehran is betting Trump will blink, or at least that the economic pain of sustained high oil prices will erode American resolve.

What happens Wednesday night

The open questions are stark. Will Vance still travel to Pakistan? Will Tehran reverse course and send representatives? Will the ceasefire hold past 8 p.m. Wednesday, or will the administration follow through on Trump's explicit promise of resumed military action?

Trump has shown a pattern in this crisis: threaten hard, pause, negotiate, then threaten again. Earlier this month he issued an ultimatum, then agreed to a two-week ceasefire. Now he says he will not extend that truce. If Tehran's parliament speaker is to be taken at his word, Iran spent those two weeks preparing for a fight rather than a deal.

The administration's willingness to target energy infrastructure if diplomacy fails adds another layer. Trump has vowed to strike Iran's energy assets, the economic lifeline of the regime, should talks collapse entirely. That threat carries weight precisely because the blockade has already demonstrated the administration's willingness to disrupt Iranian commerce at scale.

Meanwhile, the domestic political landscape around Vance continues to shift. His growing portfolio, from fraud enforcement to foreign policy to legislative tie-breakers in the Senate, has made him one of the most consequential vice presidents in recent memory. Whether the Iran mission ends in a deal, a delay, or a resumption of hostilities will shape how that record is judged.

For now, Vance sits at the White House. The clock ticks toward Wednesday evening. And Iran's answer, so far, is silence, or worse, a promise of escalation.

The real test

The administration's approach to Iran has been built on a simple premise: strength produces deals, and weakness invites aggression. The blockade, the military posture, the refusal to extend the ceasefire, all of it flows from that logic. Tehran's refusal to engage is a test of whether the premise holds, or whether the regime believes it can outlast American pressure.

Pakistan, for its part, has tried to play honest broker. But honest brokers are only useful when both sides want to talk. Right now, one side is at the White House waiting for a green light, and the other is publicly promising "new cards on the battlefield."

The American public, paying more than $4 a gallon and watching a 53-day conflict grind on, deserves clarity. They deserve to know whether their government's strategy is working or whether the ceasefire was just an intermission. Wednesday night will start to answer that question.

When a regime tells you it spent the ceasefire preparing for war instead of peace, the prudent response is to believe them, and to be ready.