In an interview this past July Trump told The New York Times that Mueller would cross a red line if he examined his or his family's finances.
Deutsche Bank, which is one of the Trump Organisation's major lenders on its real estate projects, said it would not comment on any of its clients.
This may turn out to be no big deal - perhaps Mueller will find that all Trump's transactions with Deutsche Bank were above-board and free of any amusing business, and also that nothing he discovers there will lead to evidence of any other misconduct on Trump's part. It is not clear whether Mueller is interested in the bank accounts because they are connected to the Russian Federation probe or if he is investigating another matter.
Today we learn that special counsel Robert S. Mueller III is following President Trump's money. Russian Federation has denied US intelligence agencies' conclusion that it meddled in the campaign and Trump has said there was no collusion with Moscow.
Germany's SPD: No decision on entering coalition talks
The meeting of the SPD's rank and file next Thursday will be a key date as Germany anxiously awaits signs of its next government. The SPD has repeatedly rejected to joint hands with the Union after its landslide failure in the federal elections.
The heat on the investigation of President Trump's finances has just been cranked up even further.
The president declined to say what he would do if Mueller began such an examination, but he continued, "I think that's a violation". But the fact that Mueller is looking at Deutsche Bank means his probe is reaching the very heart of Trump's financial life.
Special Counsel Robert Mueller departs Capitol Hill after briefing members of the U.S. Senate on his investigation in Washington, June 21, 2017. Papadopoulos pleaded guilty. Manafort and Gates pleaded not guilty.
On December 1, Mueller reached a plea agreement with former national security adviser Michael Flynn, who pleaded guilty to giving misleading the Federal Bureau of Investigation about his contacts with then Russian Ambassador to the US, Sergey Kislyak.
In May, Deputy Attorney General Rod Rosenstein appointed Mueller to serve as special counsel for the Justice Department, and to oversee the investigation into "any links and/or coordination between Russian government and individuals associated with the campaign of President Donald Trump, and any matters that arose or may arise directly from the investigation".