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HIGHLIGHTS-The Trump presidency on April 24 at 6:42 p.m. EDT/2242 GMT

April 24 (Reuters) - Highlights for U.S. President Donald Trump's administration on Monday: NORTH KOREA Trump says the U.N. Security Council must be prepared to impose new sanctions on North Korea as concerns mount that it may test a sixth nuclear bomb as early as Tuesday.

Top Trump administration officials will hold a rare White House briefing on Wednesday for the entire Senate on the North Korean situation, senior Senate aides say.

CONGRESS RETURNS Trump tries to press Democrats to include funds for his controversial border wall with Mexico in spending legislation as lawmakers work to avoid a looming shutdown of the federal government.

Vice President Mike Pence cuts short his Asia trip to hurry back to Washington, where the administration faces a critical week on tax reform and a funding plan to keep the government running, an aide says.

TAXES Trump's zeal to unveil a tax plan before his 100th day in office is raising questions about just how thorough his "tax reform" plans will be, amid signals his focus now is on slashing tax rates.

MAR-A-LAGO A U.S. State Department website published an article this month about President Donald Trump's Mar-a-Lago resort in Florida, stoking criticism from prominent ethics experts.

SYRIA The United States blacklists 271 employees of a Syrian government agency it says was responsible for developing chemical weapons, weeks after a poison gas attack killed scores of people in a rebel-held province in Syria.

HEALTHCARE A congressional vote on a Republican healthcare legislation plan may not come for weeks as leaders in the House of Representatives and the Senate continue negotiations over possible proposals, the White House says.

UNITED NATIONS Trump complains the United States is shouldering an unfair burden of the cost of the United Nations but says if the world body reforms how it operates, the investment will be worth it.

CABINET The Senate confirms former Georgia Governor Sonny Perdue as secretary of agriculture, leaving all but one of Cabinet positions - Labor secretary - filled.

DEFENSE Expanding the U.S. Navy to 355 ships as recommended by military leaders and backed by Trump will cost another $400 billion over the next 30 years than the currently planned 308-ship fleet, a study says.

TRADE Trump's administration has adopted a "constructive" approach to NAFTA behind the scenes, despite headlines to the contrary, the head of the biggest U.S. business lobby says in a speech in Mexico City.

(Compiled by Jonathan Oatis and Bill Trott; Editing by Grant McCool and James Dalgleish)