WASHINGTON — After days out of sight following the Capitol siege, President Donald Trump is traveling to Texas today to trumpet one of the pillars of his presidency: his campaign against illegal immigration.

Trump will be flying to Alamo, a city in the Rio Grande Valley near the U.S-Mexican border. The city is named after the San Antonio mission where a small group of Texan independence-fighters fended off Mexican forces during a 13-day siege. Most of them died but the mission became a symbol of resistance for Texans, who eventually defeated the Mexican army.

Trump's visit comes as he spends the final days of his presidency isolated, aggrieved and staring down the prospect of a second impeachment after his supporters stormed the U.S. Capitol last week in an effort to halt the peaceful transition of power.

Aides have been urging the president to use the days he has left in office to highlight what they see as the chief accomplishments of his presidency: a massive tax cut, his efforts to roll back federal regulations and the transformation of federal courts with the appointment of conservative judges.

Trump is expected to deliver remarks highlighting his administration's efforts to curb illegal immigration and the progress made on his signature 2016 campaign promise: building a "big, beautiful wall" across the length of the southern border — an imposing structure made of concrete and reinforced steel. Over time, Trump demanded modifications that have been largely rejected: He wanted it painted black to burn the hands of those who touched it; he wanted it adorned with deadly spikes; he even wanted to surround it with an alligator-filled moat.

In the end, his administration has overseen the construction of roughly 450 miles of border wall construction — likely reaching 475 miles by Inauguration Day. The vast majority of that wall replaces smaller barriers that had already existed, though the new wall is considerably more difficult to bypass.