BAVARIAN BEEF Merkel has had an often-tense history with Seehofer, and their relationship became really hard after Merkel's 2015 decision to keep Germany's borders open as migrants streamed across the Balkans.
On Sunday, a government spokesman said Merkel was seeking talks with some European Union members on migrant policy before the leaders summit at the end of the month although denied a report in Bild that she was trying to set up a special summit.
Here's a closer look at what Mr. Trump said on Monday, and what's actually happening in Germany.
The CSU faces a crucial state election in its home of Bavaria in October, and its hardline stance has widely been interpreted as an electioneering tactic as it attempts to claw back voters lost to the anti-immigrant Alternative für Deutschland party.
Merkel has been in disagreement with the leader of her Bavarian allies, the Christian Social Union (CSU), over a point in Seehofer's plan that would see Germany turn away all migrants who have already registered elsewhere in the EU.
But just last month, Germany's Interior Minister Horst Seehofer released statistics showing that crime is at its lowest level in more than two and a half decades. "Big mistake made all over Europe in allowing millions of people in who have so strongly and violently changed their culture!" he tweeted.
Saudi football team safe after plane engine catches fire at World Cup
"It was a small fire in one of the engines, the right engine, but the plane landed safely". The Saudi team was seen calmly leaving the plane on its way to the team hotel in Rostov.
Trump then trained his sights on Germany, which has experienced problems with assimilation since it took in millions fleeing the Middle East during the European migrant crisis. A university study published earlier this year found that violent crime rose by about 10 percent in 2015 and 2016, with 90 percent of that crime attributed to young male refugees.
"This is a European challenge that also needs a European solution", the chancellor said in her weekly podcast.
But she reiterated her opposition to Germany unilaterally closing its borders as this would pass the migrant burden on to neighboring countries, "unleashing undesired domino effects".
Perhaps reflecting that nervousness, Seehofer later added: "Nobody wants the end of the coalition, a collapse of the alliance or the fall of the government".
Merkel's liberal approach to immigration has been controversial in Germany, however, particularly on the right.
White House Deputy Press Secretary Hogan Gidley echoed the president's argument in an interview with FOX Monday, contrasting the permanent separation caused when a loved one is killed to the "temporary separation of families". Her government toughened asylum rules and declared several countries "safe", meaning people from there can't expect to get refuge in Germany.
The European Commission has voiced confidence that EU leaders could agree at a summit next week on handling migrants and refugees, but some diplomats were much less optimistic.
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