Khizr Khan, the father of a Muslim American soldier killed in Iraq, said President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE’s expected executive actions on immigration are alarming.

Trump reportedly plans on limiting U.S. entry for refugees and others from several Middle Eastern countries, and is expected to sign an executive order as soon as Thursday.

“Donald Trump’s race to violate constitutional principles and fundamental American values by targeting Muslims and immigrants is of tremendous concern,” Khan said in a statement Wednesday. "His expected executive orders on refugees and visas are a disturbing first step toward banning Muslims from entering our country."

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“Trump didn’t just threaten a Muslim ban, he promised this on the campaign trail, and it is incumbent on every single American to speak out against Trump’s actions today and every further step he and his administration may take to discriminate against Muslims.”

Trump is purportedly planning an executive order that will halt and then shrink refugee admissions, place a short-term ban on allowing foreigners to enter the U.S. from Iraq, Syria, Iran, Sudan, Libya, Somalia and Yemen, and pause the issuance of visas to certain countries.

Reuters reported Tuesday the refugee ban will remain intact until the State Department and the Department of Homeland Security can improve and intensify the refugee vetting process.

Trump promised “extreme vetting” of immigrants from countries associated with terrorism during his 2016 presidential campaign in an effort to prevent terrorist attacks.

The then-GOP nominee also suggested a temporary ban on Muslim immigration to the U.S. early on in his campaign — which he later toned down — and previously floated implementing a national registry of Muslims. His team has said that he has never proposed tracking people based on their religion.

Khan garnered national attention after a passionate speech during last summer’s Democratic National Convention about his son, Humayun Khan, a U.S. Army captain killed in Iraq in 2004.

Khan waved his pocket copy of the Constitution and fiercely denounced Trump’s rhetoric about Muslims.