FILE - In this Nov. 15, 2016 file photo, House Speaker Paul Ryan of Wis. speaks during a news conference on Capitol Hill in Washington.  Congress ushers in a new era of all-Republican rule, with a tight GOP grip on the House, a slim majority in the Senate and a newfound ally in the White House in Donald Trump.  (AP Photo/Cliff Owen)

FILE – In this Nov. 15, 2016 file photo, House Speaker Paul Ryan of Wis. speaks during a news conference on Capitol Hill in Washington. (AP Photo/Cliff Owen)

MCALLEN, Texas — U.S. House Speaker Paul Ryan is visiting the Rio Grande valley for a firsthand look at the U.S.-Mexico border as the Trump administration steps up immigration enforcement and prepares to ask Congress to pay for a border wall.

It’s the first time the Wisconsin Republican has visited the border, and protests have been announced to meet his arrival in McAllen, Texas, on Wednesday. Ryan is leading a small group of lawmakers on the trip.

In McAllen, Ryan will come face to face with some of the challenges that arise in building a wall along the entire 2,000-mile border, which includes much remote and inhospitable terrain as well as the Rio Grande, the river between Texas and Mexico.

President Donald Trump has not yet formalized his request to Congress to pay for the wall he promised during his campaign. It’s expected to cost $15 billion or more, making it uncertain whether Congress would go along. Trump has promised Mexico will pay, but Mexico says it won’t, and Trump’s never spelled out how that would happen, anyway.

The administration is rolling out new policies to fight illegal immigration, and subjecting millions of people who are in this country to deportation, even for minor infractions. A group called La Union del Pueblo Entero announced plans to “protest the speaker’s visit in order to show the opposition of border residents to the current presidential administration’s immigration and border policies.”

Ryan’s spokeswoman, AshLee Strong, said that Ryan will “examine the challenges of securing our border and learn more about the issues facing border communities.”