President Donald Trump will deliver a speech to congressional Republicans this afternoon, and is expected to focus on aggressively pursuing health care reform and tax reform, a senior White House official told Politico.

Trump's arrival comes just one day after signing an executive order that would strip federal grant funding from cities such as Philadelphia that protect undocumented immigrants.

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The president's presence in Philly has sparked intense protest, too. More than 3,000 activists are expected to swarm the area of the Loews Hotel in Center City, where Trump and Republicans will meet for speeches and other events.

The president's speech is expected to start at noon.