"We are going to initiate investigations into abuses of power, into corruption and into obstruction of justice," the chairman of the House committee, Rep. Jerrold Nadler, D-N.Y. said. "We will do everything we can to get that evidence."
Historically, midterm elections have always weakened the party that holds the presidency. Democrats will try to flip both chambers of Congress in their favour to block Trump's controversial policies on healthcare, migrants and the border wall.
House Speaker Paul Ryan announced he will retire next year and said he did not want his children growing up with a "weekend dad."
The bill slashes taxes for corporations and wealthy taxpayers, revamps how the US taxes multinational companies and creates a tax deduction for the owners of "pass-through" businesses.
On Tuesday, President Trump denounced the "fabricated stories" of women who have accused him of sexual harassment, and attacked a Democratic female US senator in a crude tweet after she demanded his resignation over the claims.
The US House of Representatives approves a broad package of tax cuts affecting businesses, individuals and families, moving Republicans and President Trump an important step closer to the biggest tax code overhaul in a generation.
Ending the Obama administration's healthcare reform has been a top priority for US President-elect Donald Trump.
President-elect Donald Trump, Republicans and Democrats condemned the planned move which was spearheaded by Republican representatives, some of whom are under investigation by the committee.
US President Barack Obama opposed the bill that was passed by the Senate saying it would be "detrimental to US national interests."
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