Fierce Trump Critics Who Now Endorse Donald Trump (In their Own Words)
How the GOP leaders fell in line (in their own words). · Fortune

When Donald Trump became the presumptive Republican nominee in May, those within the party who had resisted him began to line up behind him. They may have had their misgivings, but their constituents had spoken, and they would listen.

One man, however, was not so eager to get with the program - House Speaker Paul Ryan.

"I am not there right now," he told Jake Tapper of CNN in May, and he wasn't alone. In a speech at the University of Utah, 2012 Republican presidential nominee and former Massachusetts governor Mitt Romney offered harsh criticism of the real estate mogul turned politician, saying “dishonesty is Trump’s hallmark.”

On Thursday, however, Ryan announced that he would endorse Trump in the Janesville Gazette.

"Donald Trump and I have talked at great length about things such as the proper role of the executive and fundamental principles such as the protection of life…..Through these conversations, I feel confident he would help us turn the ideas in this agenda into laws to help improve people's lives. That's why I'll be voting for him this fall."

Speaker Ryan is not alone in his party as one who once spoke out against Trump, only to endorse him. In fact, it’s not unheard of for a politician to sharply criticize an opponent, then turn around and endorse, or even work for, the very person they had just lambasted.

In 1980, George Bush, Sr. called Ronald Reagan’s supply-side economic proposals “voodoo economics,” then became his vice president. In 2008, Hillary Clinton ran the infamous “3am” ad, which implied that a vote for then-Senator Barack Obama was tantamount to a vote for a nuclear holocaust. Despite the implication that her opponent was too much of a rookie to be trusted with national security matters, she still became his Secretary of State.

Still, the ferocity of the attacks leveled against Trump by Republicans at the local, state and national levels has been downright ugly, and has at times featured invective so hostile that the idea of an endorsement afterwards seemed almost laughable.

Be that as it may, many of these same people put on their best public relations smiles and boarded the Trump train.

Fortune presents a rundown of some of his detractors' most withering criticisms, followed by their eventual endorsements.

New Jersey Governor Chris Christie

January 4, 2016: “Showtime is over. We are not electing an entertainer-in-chief. Showmanship is fun, but it is not the kind of leadership that will truly change America.”