“Dear @marcorubio, you may not be #Ready4Reform but America is,” claimed a tweet from Ali Noorani, director of the National Immigration forum, which is partly funded by progressive donor George Soros. Noorani’s group helped organize the fly-in of business leaders.

“Pandering not a profile in courage,” jeered Frank Sharry, the director of America’s Voice, an advocacy group that is backing the Senate bill.

“With Rubio abandoning his own [Senate] bill, the question is not whether he can win the White House in 2016, but whether he can hold his Senate seat,” said Ben Winograd, an immigration lawyer and a former lawyer at the American Immigration Council.