Washington (CNN) Deputy Attorney General Rod Rosenstein visited the White House in December seeking President Donald Trump's help. The top Justice Department official in the Russia investigation wanted Trump's support in fighting off document demands from House Intelligence Chairman Devin Nunes.

But the President had other priorities ahead of a key appearance by Rosenstein on the Hill, according to sources familiar with the meeting. Trump wanted to know where the special counsel's Russia investigation was heading. And he wanted to know whether Rosenstein was "on my team."

The episode is the latest to come to light portraying a President whose inquiries sometimes cross a line that presidents traditionally have tried to avoid when dealing with the Justice Department, for which a measure of independence is key. The exchange could raise further questions about whether Trump was seeking to interfere in the investigation by special counsel Robert Mueller, who is looking into potential collusion by the Trump campaign with Russia and obstruction of justice by the White House.

At the December meeting, the deputy attorney general appeared surprised by the President's questions, the sources said. He demurred on the direction of the Russia investigation, which Rosenstein has ultimate authority over now that his boss, Attorney General Jeff Sessions, has recused himself. And he responded awkwardly to the President's "team" request, the sources said.

"Of course, we're all on your team, Mr. President," Rosenstein told Trump, the sources said. It is not clear what Trump meant or how Rosenstein interpreted the comment.

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