President Donald Trump addresses the daily coronavirus task force briefing in the Rose Garden at the White House in Washington, April 14, 2020.

President Donald Trump's first step toward pulling World Health Organization funding during the coronavirus pandemic has set the stage for another legal tug of war with House Democrats wary of him treading on their power.

Facing sustained backlash for his handling of the outbreak as U.S. Covid-19 cases top any other country in the world, the president on Tuesday criticized the United Nations agency for what he called its "role in severely mismanaging and covering up the spread of the coronavirus." Trump said he was "instructing [his] administration to halt funding" to the WHO during a 60 to 90-day review period.

House Democrats argued that suspending funding would hamper the global response to the disease ripping across the globe. They also contended he cannot withdraw money already appropriated by Congress under its constitutional authority — suggesting a court fight over Trump's power looms if he pulls funding.

"This decision is dangerous, illegal and will be swiftly challenged," House Speaker Nancy Pelosi said in a statement Wednesday.

The party also raised the specter of the White House's decision to withhold congressionally-approved military aid to Ukraine last year as Trump urged the country to investigate his political rival, apparent Democratic presidential nominee Joe Biden. The action led to the House impeaching Trump. The Senate acquitted him in February.

"In a desperate attempt to deflect blame, President Trump is violating the same spending laws that brought about his impeachment," House Appropriations Committee spokesman Evan Hollander said in a statement. "The President does not have the unilateral authority to withhold the United States' assessed contribution to the World Health Organization."