Trump vs. O'Rourke: Scenes from their dueling rallies in El Paso, Texas

Trump took a shot at his potential 2020 opponent, and it echoed a familiar 2016 attack: mocking crowd size.

"He has 200 people, 300 people, not too good," Trump claimed.

"A young man who’s got very little going for himself — except he’s got a great first name — he challenged us," Trump continued. "That may be the end of his presidential bid."

This number was off, according to the Associated Press, which didn't have an exact number but put O'Rourke's crowd in the thousands.

Bloomberg reporter Jennifer Epstein tweeted far larger numbers: "El Paso police estimate a crowd of 10,000 to 15,000 for the anti-Trump, anti-wall, pro-O’Rourke march and rally tonight."

INSIDER called the El Paso Police Department to confirm those numbers, but has not yet heard back. We will update as necessary.

SOURCES: Jennifer Epstein and the Associated Press

Meanwhile, lawmakers on Capitol Hill said they reached a tentative agreement on border security funding to avoid another government shutdown.

The Associated Press reports that the bill contains "$1.375 billion to build 55 miles" of a border barrier made of steel slats.

This figure is much less than the $5.7 billion that Trump was demanding, so it's unclear if he'll take this deal.

“I don’t know what they mean progress is being made," Trump said at the rally. "Just so you know, we’re building the wall anyway."

SOURCE: Associated Press, Bloomberg News

While O'Rourke spoke at the opposing march and rally, it was not one explicitly for the former senatorial candidate. It was a pro-immigrant, anti-Trump rally.

"O’Rourke spoke at a rally organized by several El Paso groups, not his own team," Bloomberg New's Epstein tweeted. "And the energy was at once pro-O’Rourke and anti-Trump. Don’t have a crowd count yet but it was certainly several thousand — and it included a mile-long walk."

SOURCE: Jennifer Epstein, Bloomberg

"We stand for America and we stand against walls," O’Rourke told the crowd, according to Bloomberg News. "We know there is no bargain in which we can sacrifice some of our humanity to gain a little more security."

SOURCE: Bloomberg

"Here is one of the safest cities in the United States of America, safe not because of walls but in spite of walls," O'Rourke said at the rally.

He attempted to refute Trump's claims about El Paso, the wall, and crime rates in a post published on Friday on Medium.

SOURCE: Reuters