(AXIOS) -- In a letter to lawmakers Sunday, House Speaker Nancy Pelosi (D-Calif.) issued a warning about the Trump administration's continued efforts to block acting Director of National Intelligence Joseph Maguire from turning over a whistleblower complaint that reportedly involves the president.
"If the Administration persists in blocking this whistleblower from disclosing to Congress a serious possible breach of constitutional duties by the President, they will be entering a grave new chapter of lawlessness which will take us into a whole new stage of investigation."
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Between the lines: It's likely that the "new stage of investigation" that Pelosi is referring to is impeachment. House Intelligence Chairman Adam Schiff (D-Calif.) — who along with Pelosi has refrained from endorsing impeachment until there's enough public support — said Sunday that the whistleblower controversy could leave Democrats with no other choice.