The delegation will include Rep. Michael McCaul, (R-Tex.), chairman of the House Committee on Homeland Security.

Ryan’s office released few details about the agenda. The Monitor of McAllen reported that the tour will include an aerial look at the region, a visit to a holding facility where immigrants are processed and a trip to the Rio Grande and the Anzalduas International Bridge, where trucks travel to and from Mexico with goods every day.

Ryan’s trip comes as Trump’s pledge to reshape the U.S. immigration system and Congress’s role in funding the plan take center stage in the new administration. Sen. John Cornyn (R-Tex.) who has led frequent delegations to the border, is taking a separate delegation of five senators and representatives to the area this week.

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On Tuesday, with the administration’s travel ban blocked by the courts for now, Homeland Security officials released new guidelines that allow federal authorities to take stronger enforcement actions against undocumented immigrants, although they cautioned that the directives are not intended to produce mass deportations.

Meanwhile, Congress is beginning to assess the cost of building a border wall, the president’s signature campaign promise. Trump has vowed to make Mexico cover the cost, but the Mexican government has balked at the plan. The project has no reliable price tag. Trump has estimated the cost at $8 billion. Recent congressional legislation pegged the number at $10 billion, and construction experts say it could be more than double that.

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Congressional Republicans seem amenable to underwriting the wall themselves — at least at first — although some budget hawks have said they want cuts to other federal spending to compensate. About 600 miles of the 2,000 mile southern border are covered by fencing that ranges in height from three feet to about 20 feet.

McAllen is a fast-growing city of 141,000 on the southern tip of Texas in the Rio Grande Valley, which last year ranked as the busiest sector for illegal border crossings from Mexico and Central America. The river snakes through the region, forming the natural border between the U.S. and Mexico. It serves as a reminder of the complicated topography of building a wall, since rivers, mountains and other rugged terrain make up much of the area.

Cornyn has taken a more nuanced approach than the president and some lawmakers to building a wall, saying that enforcement and technology must accompany any physical obstacle.