Jon Stewart hammers Republicans on Iran letter: They’re ‘f*cking cuckoo bananas’
'Daily Show' host Jon Stewart on March 10, 2015. [YouTube]

Daily Show host Jon Stewart argued on Tuesday that the letter from 47 Senate Republicans to Iranian leaders wasn't to warn them about striking a nuclear agreement with President Barack Obama -- it was really a warning about the GOP.

"'You may be able to get Obama to construct a framework of verifiable nuclear limitations in exchange for the lifting of sanctions, but you'll never sneak this sh*t past us,'" he said, mocking the letter's tone. "'We're f*cking cuckoo! We're cuckoo bananas!'"

The lawmakers involved in the letter -- including prospective presidential candidates Rand Paul (R-KY) and Ted Cruz (R-TX) -- have come under criticism for telling Iran that any deal they reach might not last beyond Obama's tenure as president.

Stewart also ridiculed the idea that it took much effort for Sen. Tom Cotton (R-AR) to convince his party colleagues to add their names as signatories.

"How did Cotton convince Republicans to publicly undercut our current president? How did he do it?" Stewart asked sarcastically. "It's the kind of persuasive rhetoric it might take to get, let's say, an unfixed dog to hump a pillow."

At the same time, however, Stewart pointed out the "situational ethics" on display from both major parties, citing a 2007 meeting between then-House Speaker Nancy Pelosi (D-CA) and Syrian President Bashar al-Assad.

Conservatives like Sean Hannity, Dana Perino and John Bolton -- all supporters of the GOP letter to Iran -- were quick to blast Pelosi at the time. But Stewart also played footage of Sen. Dianne Feinstein (D-CA), then-Secretary of State Hillary Clinton and MSNBC host Chris Matthews backing Pelosi's trip, then turning around and ripping the Republicans this year.

"You know, honestly, we could do this all day," Stewart said about pointing out the contradiction. "We do do this all day. We are sad mole people."

Watch Stewart's commentary, as posted online on Tuesday, below.