Stop Trump movement

The Stop Trump movement, also called the anti-Trump, Dump Trump, or Never Trump movement, was the informal name for the effort on the part of some Republicans and other prominent conservatives to prevent front-runner and now President of the United States Donald Trump from obtaining the Republican Party presidential nomination, and, following his nomination, the presidency, for the 2016 United States presidential election. Although Trump's campaign drew a substantial amount of criticism, he was ultimately elected in November 2016 and sworn in as president on January 20, 2017.

The movement gained momentum following Trump's wins in the March 15, 2016, Super Tuesday primaries, including his victory over U.S. Senator Marco Rubio in Florida. After U.S. Senator Ted Cruz dropped out of the race following Trump's primary victory in Indiana on May 3, 2016, Trump became the presumptive nominee, while internal opposition to Trump remained as the process pivoted towards a general election.

Following unsuccessful attempts by some delegates at the Republican National Convention to block his nomination, Trump became the Republican Party's 2016 nominee for President of the United States on July 18, 2016. Some members of the Stop Trump movement endorsed alternative candidates in the general election, such as Democratic nominee Hillary Clinton, Libertarian nominee Gary Johnson, independent conservative Evan McMullin, and American Solidarity Party nominee Mike Maturen.

...
Wikipedia