President Donald Trump is expected, today, to order the construction of a wall between the U.S. and its southern border with Mexico, the first in a series of actions this week to crack down on illegal immigration and bolster national security.

Trump’s executive order is expected to direct the department of Homeland Security to begin the process for designing and building the wall with possible involvement from the General Services Administration. Trump is also expected to ask the Congress to fund the wall’s construction.

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The immigration moves are also expected to include slashing the number of refugees who can resettle in the U.S. and temporarily blocking Syrians and others from war-torn nations from entering, at least temporarily, until a vetting process can be set up to make sure refugees or other immigrants are not linked to terrorist radical movements.

Other executive orders today are expected to seek to end sanctuary cities and the practice of releasing undocumented immigrants detained by federal officials before trial.

Dow Breaks 20,000

U.S. equities rose to all-time highs in early trading today after the series of executive orders from Trump in the first few days of this week increased bullish sentiment on Wall Street.

The Dow Jones Industrial Average broke above 20,000 for the first time, rising 150 points as Boeing and IBM contributed the most gains.