A person familiar with Mueller's investigation told the news agency Reuters on Tuesday that Germany's largest bank received a subpoena from the U.S. special counsel several weeks ago to provide information on certain money and credit transactions, confirming a report by German daily Handelsblatt published on the same day.
Special counsel Robert Mueller's "Russiagate" probe cost United States taxpayers $3.2 million in the first six months, mostly on salaries and benefits.
White House Press Secretary Sarah Huckabee Sanders reiterated Sekulow's denial of the reporting during a press briefing Tuesday afternoon.
Deutsche Bank has loaned the Trump organization an estimated $300 million for its real estate dealings prior to Donald Trump becoming president.
Deutsche Bank received a subpoena from Mr Mueller several weeks ago, according to the Reuters news agency, citing a person close to the matter.
Reports of the subpoena come after Mr Trump's former national security adviser, Michael Flynn, last week admitted he had lied to the FBI over his contact with Russia's ambassador and agreed to cooperate with Mr Mueller's investigation.
Mueller is investigating whether the Trump campaign helped Russian Federation in the Kremlin's efforts to interfere in the election to throw it to Trump. But the fact that Mueller is looking at Deutsche Bank means his probe is reaching the very heart of Trump's financial life.
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The president declined to say what he would do if Mueller began such an examination, but he continued, "I think that's a violation". The bank previously rejected those demands, saying sharing client data would be illegal unless it received a formal request to do so.
The Trump International Hotel is shown on August 10, 2017 in Washington.
Deutsche Bank is not the only Trump-related business interest that is attracting the attention of investigators.
So far, the special counsel has charged four people as part of the investigation including Manafort and Flynn.
"One obvious question is why Trump and those around him expressed interest in improving relations with Russian Federation as a top foreign policy priority, and whether or not any personal considerations played any part in that", the second official said, speaking on the condition of anonymity.
In October, Manafort pleaded not guilty to charges including conspiracy to launder money and conspiracy against the United States.