Democratic presidential front-runner Hillary Clinton will berate Republican Donald Trump for being too friendly with North Korea and too harsh on European allies on Thursday in a foreign policy speech in California designed to portray the billionaire businessman as unfit for the White House.

The speech in San Diego comes as the former secretary of state seeks to shift her attention to the Nov. 8 presidential election against likely rival Trump and away from Bernie Sanders, the U.S. senator from Vermont who is continuing his long shot bid for the Democratic nomination.

Trump has said he would sit down with North Korean leader Kim Jong Un to try to stop Pyongyang's nuclear program and has criticized the decades-old NATO alliance with mainly European nations as obsolete and too costly for the United States.