Former Sen. Jeff FlakeJeffrey (Jeff) Lane FlakeFlake urges Republicans to condemn 'vile and offensive' Trump tweets Flake responds to Trump, Jimmy Carter barbs: 'We need to stop trying to disqualify each other' Jeff Flake responds to Trump's 'greener pastures' dig on former GOP lawmakers MORE (R-Ariz.) responded to President TrumpDonald John TrumpAmash responds to 'Send her back' chants at Trump rally: 'This is how history's worst episodes begin' McConnell: Trump 'on to something' with attacks on Dem congresswomen Trump blasts 'corrupt' Puerto Rico's leaders amid political crisis 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 McCainJohn Sidney McCainMeghan McCain promotes July 17 as #GBMday to raise awareness of father's cancer The peculiar priorities of Adam Schiff Ocasio-Cortez fires back at Lindsey Graham: 'Graham wants to bring back 1950s McCarthyism' MORE (R-Ariz.) in the speech, leading many to think the comment was about him.