“Putin is a big part of the problem in Syria, not the solution,” the senior senator tweeted.

Putin's comment came in an op-ed in The New York Times published Wednesday night. It warned the U.S. not to take military action against Syria. 

Such action no longer appears imminent, as President Obama asked Congress to put off any votes on authorizing a strike. Obama seemed poised to lose those votes based on whip counts by The Hill and other news outlets. 

Secretary of State John KerryJohn Forbes KerryJuan Williams: Trump's dangerous lies on Iran Pompeo: US tried, failed to achieve side deal with European allies Trump administration braces for big week ahead in foreign policy MORE arrived in Geneva, Switzerland, Thursday morning with weapons and intelligence experts to meet with their Russian counterparts Thursday and Friday on a deal that would involve Syria giving up its chemical weaons to international control. 

Cornyn had already expressed skepticism over the diplomatic deal, saying on the Senate floor that Russia is not a “reliable partner.”