WATCH | What the Democrats control of the House means for Trump
Democrats rode a wave of dissatisfaction with President Donald Trump to win control of the US House of Representatives on Tuesday, giving them the opportunity to block Trump's agenda and open his administration to intense scrutiny.
With a House majority, Democrats will have the power to investigate Trump's tax returns, possible business conflicts of interest and allegations involving his 2016 campaign's links to Russia.
They also could force Trump to scale back his legislative ambitions, possibly dooming his promises to fund a border wall with Mexico, pass a second major tax-cut package or carry out his hardline policies on trade.
A simple House majority would be enough to impeach Trump if evidence surfaces that he obstructed justice or that his 2016 campaign colluded with Russia. But Congress could not remove him from office without a conviction by a two-thirds majority in the Republican-controlled Senate.