Former Sen. Jeff FlakeJeffrey (Jeff) Lane FlakeCheney clashes with Trump Sessions-Tuberville Senate runoff heats up in Alabama GOP lawmakers stick to Trump amid new criticism MORE (R-Ariz.) responded to President TrumpDonald John TrumpWayfair refutes QAnon-like conspiracy theory that it's trafficking children Stone rails against US justice system in first TV interview since Trump commuted his sentence Federal appeals court rules Trump admin can't withhold federal grants from California sanctuary cities 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 McCainMcCain's reset: US-Vietnam relations going strong after 25 years Senate outlook slides for GOP Juan Williams: Time for boldness from Biden MORE (R-Ariz.) in the speech, leading many to think the comment was about him.