"We are talking about a president who fired the Federal Bureau of Investigation director [James Comey] who was investigating the president for his connections to Russian involvement in the president's election", he added.
President Donald Trump is congratulating graduates of the U.S. Coast Guard Academy for choosing military service.
"Look at the way I've been treated lately, especially by the media", the president said, opening his arms wide, as if inviting a much-needed hug.
President Donald Trump poses for a photo with U.S. Coast Guard Academy graduate Brendan Ryan Sullivan during commencement exercises at the U.S. Coast Guard Academy in New London, Conn., Wednesday. You can't let them get you down.
"You can't let the naysayers get in the way of your dreams", Trump said. "I guess that's why we won".
By its end, Trump had turned his commencement address into a combination rally and commentary on his present adversity.
Referring to the unit's smaller budget compared to other military branches, Trump told graduating cadets that they'd done "amazing work ... under budget and ahead of schedule", and said that "we're doing a lot of that in the United States government".
Trump's speech continued, with him saying, "the more righteous your fight, the more opposition that you will face".
The last straw for Rosenstein may have been a New York Times article reporting that Trump tried to persuade Comey to drop an investigation into Michael T. Flynn, the former national security adviser, according to a memo Comey wrote.
The president's troubles then grew after press reports that he disclosed classified intelligence to Russian officials during a private White House meeting, potentially compromising an American ally that was the source of the information.
Some legal analysts have said Mr Trump's possible pressure on Mr Comey to end the Flynn probe and his decision to fire the FBI chief in the midst of the agency's investigation of the Russian Federation matter could amount to obstruction of justice, a charge that could be invoked in any attempt to impeach Trump and remove him from office.
HORSLEY: After the last few days, the administration would undoubtedly like to have its own fresh start, but it may take more than one Coast Guard speech to beat back the political waves now breaking over the White House. All those politicians who actually got assassinated? Trump himself said he had "an absolute right" as president to share "facts pertaining to terrorism" and airline safety with Russian Federation.
At the White House, nerves were on edge as well.
Trump did not mention Comey during the almost half-hour address, but seemed to allude to the multiple controversies swirling around him. She's concerned about relatives who are serving in the Coast Guard on the president's watch. He dismissed outrage over Trump's disclosures as USA politicians whipping up "anti-Russian sentiment".
Comey's memo would be the clearest evidence to date that the president has tried to influence the investigation. "I think we follow the evidence, we obtain the evidence, we hear the testimony and then we decide just what does this show about the president's conduct".
The intensifying drama comes as Trump is set to embark Friday on his first foreign trip, which had been optimistically viewed by some aides as an opportunity to reset an administration floundering under an inexperienced president.