President Donald Trump tweeted early Wednesday morning that his administration will be announcing "strong action" to ensure border security.

In his tweet, he said Democrats are in the way of progress and "want people to pour into our country unchecked."

Our Border Laws are very weak while those of Mexico & Canada are very strong. Congress must change these Obama era, and other, laws NOW! The Democrats stand in our way – they want people to pour into our country unchecked….CRIME! We will be taking strong action today. — Donald J. Trump (@realDonaldTrump) April 4, 2018

Trump has emphasized immigration this week; today marks the fourth day in a row he has tweeted about immigration.

On Monday and Tuesday, he tweeted about a caravan of immigrants coming mainly from Honduras to cross the U.S. border.

The big Caravan of People from Honduras, now coming across Mexico and heading to our "Weak Laws" Border, had better be stopped before it gets there. Cash cow NAFTA is in play, as is foreign aid to Honduras and the countries that allow this to happen. Congress MUST ACT NOW! — Donald J. Trump (@realDonaldTrump) April 3, 2018

On Sunday, he tweeted that border patrol agents are unable to do their jobs because of "ridiculous liberal" laws.

Border Patrol Agents are not allowed to properly do their job at the Border because of ridiculous liberal (Democrat) laws like Catch & Release. Getting more dangerous. "Caravans" coming. Republicans must go to Nuclear Option to pass tough laws NOW. NO MORE DACA DEAL! — Donald J. Trump (@realDonaldTrump) April 1, 2018

It remains unclear exactly what the president will announce today, and if it will be different from remarks, made Wednesday, about sending the National Guard to the southern border.