Foreign diplomats are expressing alarm to U.S. government officials about what they say are inflammatory and insulting public statements by Republican presidential front-runner Donald Trump, according to senior U.S. officials.

Officials from Europe, the Middle East, Latin America and Asia have complained in recent private conversations, mostly about the xenophobic nature of Trump's statements, said three U.S. officials, who all declined to be identified.

"As the (Trump) rhetoric has continued, and in some cases amped up, so, too, have concerns by certain leaders around the world," said one of the officials.

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Over the last five years, perhaps no elected official in the country has been more aggressive in placing limits on voting and registration than Kansas Secretary of State Kris Kobach.

He authored a provision that created a two-tiered voting system under which some Kansans could cast a ballot for their president but not their governor or any other statewide official. On Jan. 15 a Kansas district court judge struck down the measure, calling it a violation of the state’s constitution and sharply rebuked Kobach, writing, “No such authority exists at all … to encumber the voting process as he has done here.”

After failing to secure a single delegate in the New Hampshire Republican primary, New Jersey Gov. Chris Christie is expected to suspend his presidential campaign Wednesday.

Christie could announce his departure from the presidential race as soon as Wednesday afternoon after he meets with advisors, an anonymous source familiar with the plans told ABC News.

"We bet the ranch on New Hampshire, and no one ever anticipated the Trump phenomenon," the source said. "He's a realist."

The two former allies of Gov. Chris Christie charged in the George Washington Bridge lane-closing case are in court seeking documents the governor's office wants to keep confidential.

Bill Baroni and Bridget Kelly are accused of orchestrating the closures of access lanes to the bridge in September 2013 to punish a local mayor for not endorsing Christie's re-election.

Their trial on wire fraud and civil rights counts is scheduled for mid-May.

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