Senate Democrats are demanding Republicans postpone a vote scheduled for Thursday on Russell Vought, President Trump’s nominee to head the Office of Management and Budget, after the budget office on Monday issued a broadly worded memo freezing large swaths of federal assistance.

Trump’s early, extraordinary steps pose a direct challenge to a fundamental underpinning of the Constitution: the power of the purse.

President Donald Trump’s administration issued a memo Monday ordering widespread federal assistance to be temporarily paused, as Trump and his allies have argued he can block government funds that Congress has already authorized, despite a federal law forbidding it.

Palm Beach County Sheriff's Office is asking county officials for over $45 million regarding security for President Donald Trump. Here's what to know

The Constitution, federal law and court decisions make it clear: President Donald Trump's order to pause federal funding is against the law, legal experts tell ABC News.

Donald Trump promised to do everything he could to challenge a Nixon-era impoundment law. The OMB's grant freeze is likely just the first step.

The withdrawal of the federal freeze was a stunning about-face for President Donald Trump’s White House, which has so far pushed the envelope to reshape the federal government, sowing chaos and confusion in firing career civil servants, pausing foreign aid programs and offering federal workers a buyout.

Congressional Democrats and good-government groups say President Donald Trump 's Monday night directive to pause the distribution of trillions of dollars in federal grants and loans represents an immense power grab that would upend the constitutional separation of powers between different branches of government.

Donald Trump wants to abolish income tax, cut corporate taxes, eliminate taxes on tips, overtime, and Social Security benefits, and impose tariffs to boost the US economy.

The matter was so important that it was a central issue in the Glorious Revolution of 1688 when Parliament and its allies forced the abdication of King James II and installed in his place King William and Queen Mary. The ascension of the dual monarchs was contingent upon their accepting the English Bill of Rights.

Two sources familiar with the plan told NBC News the Trump administration is considering pulling funding from TSA and redirecting it to ICE.

President Donald Trump has declared an all-out war on congressional power. And his allies on Capitol Hill aren’t doing much to fend off the invasion.