Upon returning from the G-20 summit, President Donald Trump on Sunday promptly posted a series of tweets on his meeting with Russian President Vladimir Putin that both contradicted his top diplomat and sparked criticism from his fellow Republicans.

According to Trump, the two leaders brought up collaborating on “an impenetrable Cyber Security unit” ― an idea that drew immediate mockery, given Russia’s cyberattacks against the U.S. in last year’s election.

Sen. Marco Rubio (R-Fla.) tweeted that “partnering with Putin on a ‘Cyber Security Unit’ is akin to partnering with [Syria’s President Bashar] Assad on a ‘Chemical Weapons Unit.’”