During the show on Fox Business, host Stuart Varney said that Merkel's policy was "catastrophic" for Germany.
"It was the downfall of Germany, one of the worst things that ever happened to Germany – this president knows that, he's trying to prevent that from happening here," said Trump.
The president's daughter was immediately faced with a wave of condemnation from leftists.
While obviously nowhere near on par with what happened during the 1930s and 40s, the outrage directed towards Trump only serves to hide the fact that Merkel's migrant policy has indeed been a disaster for Germany.
Merkel went from being the most popular leader in Europe to one of the most unpopular, primarily because of her "refugee" policy.
According to figures from the German Federal Criminal Police Office (BKA), migrant crime targeting German citizens soared by over 23 per cent in a single year.