Donald Trump is expected to propose an ideological test that would determine whether visa applicants support American values before they are authorized to enter the U.S., according to multiple reports.

The Republican presidential nominee will deliver a speech on terrorism Monday afternoon as he looks to regain momentum following the worst two weeks yet for his campaign. Months after outlining his "America First" foreign policy vision, Trump is slated to expand on what he would do as president to protect the U.S. from existential threats and domestic terror strikes.

Trump campaign sources told the Associated Press that the candidate's latest package of anti-terror proposals will include a "test" for U.S.-bound immigrants and refugees that would evaluate their attitude toward issues like gay rights and gender equality. The screening process would be augmented with possible reviews of immigrants' social media profiles or interviews of their friends and relatives.

Trump escalated his calls for increased security checks and a more intensive vetting process for immigrants shortly after the terror attack in Nice, France, last month.

"I would be so extreme in terms of documentation," he told Fox News' Greta Van Susteran. "I would not allow people to come in from terrorist nations. I would do extreme vetting, too."

After calling for a "total and complete" ban on Muslim immigration to the U.S. last fall, Trump will outline a more refined version of that original plan during his speech Monday in Youngstown, Ohio.

In the months since his "Muslim ban" first elcited an explosive reaction from the Muslim American community, Democrats and constitutional conservatives, Trump has said his policy would apply only to immigrants coming from countries that sponsor terrorism. Though he has yet to reveal which countries would be included, top campaign surrogates have suggested the ban could apply to Egypt, Syria, Iraq, Libya, Afghanistan, Pakistan and Yemen.

"As he laid out in his Orlando remarks, Mr. Trump will describe the need to temporarily suspend visa issuances to geographic regions with a history of exporting terrorism and where adequate checks and background vetting cannot occur," Stephen Miller, a senior campaign adviser, told the AP.

Trump's decision to spell out his national security agenda comes less than a week after a mix of 50 GOP officials, who served in Republican administrations or the intelligence community, said he "would put at risk our country's national security and well-being" in an open letter to American voters.