In letters to the White House and State Department, top Democrats earlier this month demanded records related to what they say are Trump and Giuliani’s efforts “to coerce the Ukrainian government into pursuing two politically-motivated investigations under the guise of anti-corruption activity” — one to help Trump’s former campaign chairman Paul Manafort, who is in prison for illegal lobbying and financial fraud, and a second to target the son of former vice president Joe Biden, who is seeking the Democratic nomination to challenge Trump.

“As the 2020 election draws closer, President Trump and his personal attorney appear to have increased pressure on the Ukrainian government and its justice system in service of President Trump’s reelection campaign, and the White House and the State Department may be abetting this scheme,” the chairmen of the House Intelligence, Foreign Affairs and Oversight committees wrote, citing media reports that Trump had threatened to withhold $250 million in aid to help Ukraine in its ongoing struggle against Russian-backed separatists.

Lawmakers also became aware in August that the Trump administration may be trying to stop the aid from reaching Ukraine, according to a congressional official.