Story highlights Maine Republican Sen. Susan Collins said her party's presumptive nominee needs to have more "presidential"

Collins said Wednesday she was not yet ready to endorse Donald Trump's presidential bid

Washington (CNN) Maine Republican Sen. Susan Collins said she won't endorse GOP presumptive presidential nominee Donald Trump until he starts behaving more "presidential."

"I would love to be able to endorse Donald Trump, but he really has to change the approach that he's taken," she told CNN's Chris Cuomo on Wednesday on "New Day." "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."

Multiple Republican leaders have criticized Trump for comments he made suggesting that Latino and Muslim judges could not rule fairly because of their ethnicity and religion.

Trump on Tuesday said Republicans who are critical of his comments against a federal judge with Mexican heritage "have to get over it" and "they shouldn't be so angry for so long."

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