JD Vance has warned that 94 million "desperate people" could flood into Europe in the wake of the Iran war.
The US Vice President issued a fresh migration warning as he claimed a deal with Iran was needed to prevent another refugee crisis rocking the West.
Mr Vance argued that "conservative hawks" in the Republican Party - naming former Vice President Mike Pence - were attempting to "derail the deal" with the Iranian regime.
The Vice President said Donald Trump's critics did not provide any actual solutions to the Iran war.
"If you actually look at what they're proposing, they just want the military campaign to go on forever, and they can't actually identify what it is that they're trying to accomplish," he told Joe Rogan's podcast.
"None of them can identify what is they're trying to accomplish."
He argued that the US Government would not just "bomb them to oblivion", citing learnings from former President Barack Obama's 2011 intervention in Libya, which resulted in the violent death of Muammar Gaddafi.
Mr Vance said: "Libya basically turned into a failed state. You had a refugee crisis. You had people pouring into Europe, pouring into other parts of other parts of Africa.
JD Vance said 'conservative hawks' within the Republican Party were trying to 'derail the deal' with Iran
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"You had a lot of violence, a lot of terrorism come from that. I do think that there are people who would like that to be the outcome in Iran. But then I say again, what is in our interest?
"How is it in the United States' interest to have 94 million desperate people flooding into Europe, flooding into the United States, to have, you know, sort of the the terrorist infrastructure that can get established when you fan terrorists all over the world? We've run this experiment before."
The Vice President, also pointing to Syria, said every time there has been a military intervention it has led to a "refugee crisis" and a "spike in terrorism".
An estimated 13.5 million Syrians were displaced after the civil war, according to the United Nations.
Many Libyan refugees fled to neighbouring countries, with more than 600,000 people alone fleeing into Tunisia.
LATEST ON THE IRAN WAR:
The Vice President warned that 94 million migrants could flood into Europe if Iran was bombed
|GETTY
One month ago, the US and Iran agreed upon a 14-point memorandum of understanding (MOU).
Within the MOU was an agreement to create a $300billion fund to rebuild Iran.
Mr Vance said investment in the fund would come from a "massive number" of US-aligned Gulf States, adding that "none of the money" would come from the US.
He said: "If Iran's biggest enemies in the region are saying: 'We'd like to invest if they've changed their behavior. Would the United States let us? Would we release the sanctions that would make it possible for the UAE and Saudi Arabia and other countries to invest in Iran?
"Our attitude was, well, isn't that a victory for us?
"If Iran's biggest enemies see that they have changed themselves so much that they're willing to invest in the Iranian economy, isn't that like the definition of a win-win?"
Iran and the US have exchanged strikes throughout the month, despite the signing of the MOU
|US DEPARTMENT OF DEFENSE
The US and Iran have exchanged military strikes throughout the month.
Iran claimed to have shut down the Strait of Hormuz as Mr Trump reintroduced a blockade on ports in the vital waterway.
Last night, the Americans struck Iran's coastal defenses and missile sites, while Iran threatened to shut off more regional energy exports, saying it was engaged in an "existential war" with America.
The latest escalation comes days after a fragile truce collapsed, raising fears of a return to full-scale war.
Military operations are also keeping ships from sailing through the waterway, which carried about a fifth of global oil and gas shipments before the war.
Brent crude oil, the international benchmark, closed at a one-month high of $84.95 a barrel on Wednesday.