President Biden and Donald Trump both traveled to southern Texas today to use the border with Mexico as a backdrop for their push to convince voters that they would best handle the recent surge in migrants crossing into the U.S.

The day offered a split-screen preview of a debate that is likely to continue in the months leading up to November’s presidential election. Recent polls showed voters’ views on immigration have shifted to the political right, including one that found that Americans are most likely to say that immigration is the country’s top problem.

Biden, who has in recent months changed his tune on immigration and begun to favor a border crackdown, visited Brownsville. He met with border officials there and delivered a speech criticizing Republicans for blocking a recent bipartisan immigration bill and daring Trump to team up with him in tightening border security.

“We can do it together,” Biden said. “You know and I know it’s the toughest, most efficient, most effective border security bill this country has ever seen. Instead of playing politics with the issue, why don’t we just get together and get it done.”

Trump, who was more than 300 miles away in Eagle Pass, delivered a darker address, highlighting what he called an “invasion” of migrants into the U.S. “This is like a war,” Trump said, repeating the anti-immigration message that has been central to his political identity since he first ran for president.

In related news, a federal court blocked a Texas law that would allow police to arrest migrants who cross from Mexico without authorization.