President Donald Trump should tell Senate Majority Leader Mitch McConnell (R-Ky.) “to go nuclear” to pass immigration reforms by ending the 60-vote supermajority threshold after Mollie Tibbetts’ murder, David Bossie said Wednesday on Fox News’ “The Story With Martha MacCallum.”

“So if I was advising this president, I would say, ‘Tell Mitch McConnell to go nuclear.’ You have to say this is a national security issue, a simple majority of the Senate to pass border security,” said Bossie, who was Trump’s deputy campaign manager in 2016.

McConnell (pictured above left) can change Senate rules with a simple majority vote of the chamber.

Tibbetts, a 20-year-old University of Iowa student (pictured above right), was reported missing last month. The five-week manhunt that ensued concluded in tragedy Tuesday when Rivera (pictured above) led authorities to a body believed to be hers.

Suspected murderer Cristhian Bahena Rivera, an illegal immigrant, told authorities he saw her jogging, got out of his car and ran alongside her, causing her to feel threatened. She said she was going to call the police, at which point Rivera said he blacked out. He then led authorities to her body.

Rivera worked for four years at Yarrabee Farms in Iowa using false identification, according to the farm’s co-owner. Rivera has been charged with first-degree murder, and his bond was set at $5 million.

“This is an unbelievable tragedy that the American people are revolted by, and it crystallizes this issue once again, that border security is our national security,” Bossie reiterated.

“The president of the United States, he made a promise to the American people. He is going to support, he is going to close the borders, he is going to build a wall, and he is going to secure the American people.”

“The president wants a fully funded wall, $25 billion. How many more Mollie Tibbetts and Kate Steinles do we need before we spend the money?” Bossie asked. “And I would say to the Senate majority leader, McConnell, ‘Let’s go to 51 votes on this. This is a national security issue, and we’re done talking about it.'”

Steinle’s 2015 death at the hands of illegal immigrant Jose Ines Garcia Zarate in San Francisco came to the forefront of national discourse when Trump highlighted it during his 2016 presidential election campaign.

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Related: Mollie Tibbetts’ Murder Was ‘Senseless’ and ‘Needless,’ Art Arthur Says

If Congress doesn’t act and pass the legislation Trump has asked it to produce, then there will be “more blood on politicians’ hands,” Bossie warned.

Republican National Committee (RNC) spokesperson Kayleigh McEnany warned Thursday on Fox News’ “America’s Newsroom” that “American citizens must come first” — even as Democrats and liberal activists decry the since-scrapped Trump administration policy of separating illegal immigrant children from their families at the border.

“This example in Iowa is another example that this happens in the heartland,” McEnany said. “I’ve sat across from a mother, Sabine Durden, that lost her son, Dominic. I’ve seen her tears. I’ve seen the locket she wears around her neck with his ashes.”

“This is a real problem. Not a single American citizen — not the Tibbetts family, not the Steinle family, not the Durden family — should lose their child and be permanently separated because someone was in this country and the laws were not enforced,” McEnany insisted. “American citizens must come first.”