President TrumpDonald TrumpTexas announces election audit in four counties after Trump demand Schumer sets Monday showdown on debt ceiling-government funding bill Pennsylvania AG sues to block GOP subpoenas in election probe MORE's daughter-in-law Lara TrumpLara TrumpPast criticism of Trump becomes potent weapon in GOP primaries Trump endorsement shakes up GOP Senate primary in NC Lara Trump calls on Americans at border to 'arm up and get guns and be ready' MORE remarked Thursday that German Chancellor Angela Merkel's decision to allow migrants into the country was "one of the worst things that ever happened to Germany."

“When there was a march across Europe by a million people who wanted to get into Western Europe, Angela Merkel let them in,” Fox Business host Stuart Varney said during an interview with Lara Trump, an adviser on President Trump's reelection campaign, on the network.

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“It was the downfall of Germany, it was one of the worst things that ever happened to Germany,” Trump responded. “This president knows that, he’s trying to prevent that from happening here.” 

Trump, who is married to the president's son Eric TrumpEric TrumpMary Trump calls Donald Trump Jr. her 'stupidest' relative Eric Trump lawyer in New York attorney general's fraud case quits Eric Trump to speak at conference led by prominent anti-vaxxers MORE, made the remark as part of a discussion about a migrant caravan that Varney said is headed toward the U.S.-Mexico border. He said that the footage of the migrants reminded him of migrants moving through Europe.

Germany accepted more than 1 million refugees in 2015 during what Merkel called "extraordinary" circumstances following major conflicts in Syria, Iraq and Afghanistan.

President Trump went after Merkel's immigration policies during the 2016 presidential race, at one point calling them "insane" and accusing her of "ruining Germany." The pair have had an at-times strained relationship over other issues such as tariffs, a gas pipeline with Russia and the Iran nuclear deal.

Trump is known for his hard-line stance on immigration, and earlier this year he sparked controversy when he declared a national emergency to reallocate funding for his long-proposed wall at the U.S.-Mexico border after Congress refused his funding demands.