The activists appeared to universally support the president and his long-held pledge to build a border wall, and they seemed to be making their own symbolic barrier where the border fence now finishes.
Trump's rally comes just four days before the possibility of another government shutdown.
The former three-term congressman from Texas is joining a one-mile march that will end with O'Rourke giving a speech critical of Trump's push for billions in federal funds to extend a wall along with border with Mexico.
Their demonstration came ahead of the president's rally to be held Monday in the El Paso Coliseum.
Supporters of President Donald Trump's proposed border security measures gathered to form a human "wall" along a section of the U.S. -Mexico border in New Mexico on Saturday. So far, O'Rourke has not made a decision.
Minor among 9 Palestinians detained by Israeli forces
The suspect comes from the flashpoint city of Hebron in the south of the occupied West Bank , police said. Protests have dwindled in recent months after an informal agreement between Israel and Hamas.
Women's March El Paso has organized a counter to Trump's visit.
During his State of the Union address Trump highlighted El Paso as a positive example of what border barriers could achieve.
The remarks angered local politicians, including O'Rourke and the city's Republican mayor, because El Paso's crime rate was far below the national USA average before its border fence was expanded in 2005.
In his State of the Union, President Donald Trump said a "powerful barrier" had cut crime rates and turned El Paso, Texas, from one of the nation's most unsafe cities to one of its safest. "El Paso's example shows that only with a physical barrier can we stop the flow of illegal immigration, drugs, and crime and secure our southern border", Brad Parscale, campaign manager, said in a statement.
In her penned letter to the White House, Escobar asked the president to apologize to the residents of the city for the comments. "Law enforcement in our community continues to keep us safe".