On "Outnumbered" today, Meghan McCain and Geraldo Rivera clashed while debating if the Trump administration should work with Russian President Vladimir Putin in the fight against ISIS.

Putin met with U.S. Secretary of State Rex Tillerson in Moscow on Wednesday to discuss the ongoing civil war and refugee crisis in Syria.

The meeting came just days after the Trump administration launched missile strikes on a Syrian airbase.

The strikes, which were in response to Syrian President Bashar al-Assad using chemical weapons on civilians, angered Assad's allies in Moscow.

Rivera said the U.S. and Russia should come together to defeat ISIS once and for all, which he said is the primary goal in the region.

"Let this be our mini-summit conclusion: no gas, and kill ISIS as a priority," Rivera said.

McCain argued that it's "painfully naive" to trust Putin, who has aided and abetted the Assad regime for years.

"This is someone you think America should be bedfellows with in the fight against ISIS? And you think we can trust them to do that and have America's core interests at heart?" McCain asked.

Rivera acknowledged that Assad is a "monster," but he cautioned against losing sight of who the primary enemy is.

"What you are saying is that we should team up with Vladimir Putin, which I think is not only naive but actually impossible," McCain said. "This is someone who has been committed in every conceivable way of aiding and abetting this genocide."

She added that partnering with a "thug," "dictator" and "murderer" like Putin will be a very difficult sell to the American people.

Watch the back-and-forth above, and see Trump address Russia and much more in his wide-ranging Fox Business Network interview with Maria Bartiromo.

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