Democrats issued and then voted to approve a 300-page report outlining the evidence gathered so far in the impeachment inquiry against President Donald Trump.
Tuesday's move paves the way for lawmakers to potentially draw up articles of impeachment.
The second phase of the impeachment inquiry can now kick off on Wednesday at the House Judiciary Committee, as lawmakers will publicly consult legal scholars on the constitutional framework for the steps forward.
The intelligence committee in the Democratic-controlled House of Representatives issued the report, based on weeks of testimonies by top government officials and documentation, including phone records.
A vote saw the report adopted strictly along party lines, with Republicans remaining firmly behind Trump.
The president is accused of abusing the power of his office by running a "pressure campaign" with his inner circle to coerce Ukraine into digging up dirt on his domestic political rival, Democratic presidential candidate Joe Biden, ahead of elections next year.
Trump allegedly conditioned a meeting at the White House and nearly $US400 million ($A584 million) in military aid on Ukraine announcing a corruption probe into Biden.
"The evidence of the President's misconduct is overwhelming, and so too is the evidence of his obstruction of Congress," the Democrats' report said.
"The president placed his personal political interests above the national interests of the United States, sought to undermine the integrity of the US presidential election process, and endangered US national security."
Intelligence Committee chairman Adam Schiff said lawmakers needed to move quickly, to protect the election next year, noting that there was already foul play in the last election, in which Russia interfered, allegedly to boost Trump.
"We do not intend to delay when the integrity of the next election is at risk," he said.
"I am gravely concerned that if we merely accept this, we invite not only further corruption of our elections by this president, but we also invite it by the next president."
House Democrats seem set to vote on impeachment before Christmas, setting up a trial in the Senate early next year.
Democratic primary elections start in February and pundits have suggested that the party is keen to prevent spill-over into their internal process for nominating a presidential candidate to challenge Trump in November.
The White House denounced a "sham process," and brushed off the testimonies of the government officials who said there was quid pro quo between Trump and Ukraine on Biden and that there were national security concerns about the hold up of the aid.
The president, who is in London for a NATO meeting, denounced Schiff as "deranged" and insisted he has the full support of his party.
The Judiciary Committee, chaired by Jerry Nadler, would be the panel tasked with drawing up the articles of impeachment. Observers expect the House to vote to impeach, but the Senate will likely not have a two-third majority to remove Trump from office.