Dec. 8, 2015:

“Donald Trump’s proposal is not based on facts, and it does not reflect our American values. It’s just plain wrong; it’s unfair, and it would alienate important Muslim nations, like our allies Jordan and Turkey, which have been critical in the fight against Islamic extremism. It also casts an unfair shadow on patriotic, law-abiding American Muslims and on the thousands of American Muslims who serve patriotically and loyally in our military.”

Source: Collins speaks out on Trump proposal to ban Muslims

May 1:

“I was an early supporter of Jeb Bush and continue to believe that he would be the best choice for president. Since he dropped out of the race, I have not endorsed another candidate.”

Source: Collins ‘not waiting by my phone’ for invitation to be Trump’s running mate

May 8:

“I would like to see changes in his approach. He needs to mend a lot of fences if he wants to build that wall (on the Mexican border).”

Source: Collins says Trump needs ‘changes in his approach’ but she’ll back Republican nominee

June 6:

“Donald Trump’s comments on the ethnic heritage and religion of judges are absolutely unacceptable. His statement that Judge (Gonzalo) Curiel could not rule fairly because of his Mexican heritage does not represent our American values. Mr. Trump’s comments demonstrate both a lack of respect for the judicial system and the principle of separation of powers.”

Source: Collins calls Trump’s comments on judges ‘absolutely unacceptable’

June 8:

“I would love to be able to endorse Donald Trump, but he really has to change the approach that he’s taken. If I were giving him advice, I would tell him he should own up to making mistakes. He should apologize to the judge and to the American people. And he should stop insulting people.”

Source: Collins urges Trump to apologize for remarks about judge

July 23:

“Like many Americans, I am struggling with my choices.”

Source: Collins says Trump hasn’t done enough to win her endorsement

July 31:

“I am appalled by Donald Trump’s actions and by his continuing to criticize and attack the Khan family. It is just inconceivable to me that he is continuing to do it. And it makes it more difficult for me in making my final decision on whether or not I can support him.”

Source: Collins joins mounting criticism of Trump over fight with soldier’s family

August 8:

“I will not be voting for Donald Trump for president. This is not a decision I make lightly, for I am a lifelong Republican. But Donald Trump does not reflect historical Republican values nor the inclusive approach to governing that is critical to healing the divisions in our country.”

Source: Susan Collins: ‘I will not be voting for Donald Trump’