President TrumpDonald John TrumpRussian sanctions will boomerang States, cities rethink tax incentives after Amazon HQ2 backlash A Presidents Day perspective on the nature of a free press MORE's daughter-in-law Lara TrumpLara Lea TrumpThe Memo: Trump threatens to overshadow Democrats in Iowa Trump allies to barnstorm Iowa for caucuses Biden responds to Sullenberger op-ed: 'There's a lot of kids who I bet needed to hear it' 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 Frederick TrumpHouse Democrats question Secret Service on payments to Trump properties Trump hotels charge Secret Service up to 0 per night while protecting him: report Beach Boys's Brian Wilson asks fans to boycott concert at hunting event featuring Donald Trump Jr. 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.