The number of migrants arrested after attempting to enter the United States from Mexico has dropped to levels not seen since the Trump administration, an abrupt turnaround just in time for Vice President Kamala Harris‘s presidential run.

Four Border Patrol officials with access to federal government data shared with the Washington Examiner that the number of migrants apprehended each day for illegally entering the U.S. from Mexico has averaged between 1,670 and 2,500 arrests over the past 10 days.

Those figures track with the final months of 2020, right as former President Donald Trump prepared to leave office. Then, arrests averaged between 2,350 and 2,500 per day — or between 65,000 and 75,000 arrests in a month, according to Border Patrol statistics.

With three months until the November election and immigration continuing to top voters’ concerns, President Joe Biden faces pressure to maintain the state of the border as he passes the baton to Harris as the Democratic Party’s new presumptive nominee. Harris was tasked with addressing the root causes of the migration crisis as vice president, a role the GOP has dubbed the “border czar.“

Border crossings, which are based on the number of migrants arrested since not all people crossing are apprehended, peaked in December 2023. Daily arrests topped 10,000 people multiple days that month.

In February, Republicans impeached Homeland Security Secretary Alejandro Mayorkas over his management of the southern border and have long-touted Trump’s border policies as the only way to return illegal immigration levels to previous norms.

The precipitous drop in illegal immigration since last December is a notable change of course for Biden, who oversaw the historic border crisis. The monthly number of arrests has slowly decreased over the past six months, dropping from 250,000 last December to 83,000 in June.

July is expected to be even lower than June, rivaling the 71,000 figure that Trump saw in his last full month in office.

Border Patrol’s overseeing agency, U.S. Customs and Border Protection, has attributed several actions to the drop, as well as bilateral talks with Mexican government officials last December that have led to improved cooperation between countries in dealing with illegal immigration.

In May, CBP said it was ramping up removal flights or the return of illegal immigrants to their countries once they reach the southern border.

“We have executed the largest surge of removals and disruptive activities against human smuggling networks in the past decade,” said Troy A. Miller, a senior official performing the duties of the commissioner, in a statement. “We have redoubled our efforts, in coordination with partners throughout the hemisphere and around the world, to disrupt the criminal organizations and transportation networks who are putting vulnerable migrants in danger while peddling lies and profiting from them.”

The American Immigration Council acknowledged the drop as the result of a crackdown in Mexico.

“Beginning in January 2024, a crackdown by Mexico with the goal of ‘wearing out’ migrants has made it harder for people to get to the U.S. border,” wrote AIC Senior Fellow Aaron Reichlin-melnick in a July 19 blog post. “As a result, border apprehensions have dropped every month of 2024 so far.”

The decline continued through June, when Biden took executive action and implemented a new rule to turn away people at the border rather than release thousands who were crossing daily into the interior of the country to await court dates years down the road.

“This precipitous drop has sent border crossings to the lowest level in four years. It also reflects the fragile state of asylum-seekers, caught in an increasingly tight vise between state pressure and rising desperation,” wrote Adam Isacson, director for defense oversight for human rights group, Washington Office on Latin America, in an email update last week.

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The U.S. and Mexico crackdowns on illegal immigration have built up frustration among migrants who are looking at other ways for admission.

As recently as late July, migrants began gathering and walking as part of a “caravan” through Central America and Southern Mexico, bound for the U.S.