Former Sen. Jeff Flake Jeffrey (Jeff) Lane FlakeHow fast population growth made Arizona a swing state Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Republican former Michigan governor says he's voting for Biden MORE (R-Ariz.) responded to President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE’s remarks that he is "very happy" some Republican senators have left and "gone on to greener pastures."



Flake, a frequent Trump critic before leaving the Senate last year, responded by tweeting a picture of himself standing on a beach with the caption "greener pastures."



Flake included a link in the tweet to a report detailing the remarks Trump made Wednesday while speaking to the Faith and Freedom Coalition.

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Flake shot down rumors of a possible 2020 challenge to Trump and joined CBS News as a political contributor. He is set to join Harvard's Institute of Politics this fall as a resident fellow.

Although he was a vocal critic of Trump and many of his hard-line immigration policies, Flake voted with the Republican bloc most of the time.

It is unclear who Trump was referring to with his "greener pastures" remarks Wednesday, but he had previously referenced the late Sen. John McCain John Sidney McCainAnalysis: Biden victory, Democratic sweep would bring biggest boost to economy The Memo: Trump's strengths complicate election picture Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE (R-Ariz.) in the speech, leading many to think the comment was about him.