The U.S. Justice Department said the two men, one of whom was in the United States illegally, admitted guilt in a crash that killed 55 in Chiapas, Mexico.
The Kentucky senator has served since 1985 and was the Republican leader from 2007 until last year, serving as both majority and minority leader.
More than 300 infections have also been recorded in other states.
The Department of Homeland Security said the online portals put up by local and state governments exposes ICE agents to danger.

Polestar says all future U.S. models from model year 2027 onward are affected by the existing connected-vehicle rule.
The defendant also allegedly failed to disclose that he was once a lieutenant colonel in the Chinese military, according to prosecutors.
In 2026, 62 Chinese spies were identified in the United States.
The majority held that professors’ speech is legally protected, but a dissenter said states should control their own classrooms.
Waymo reported the teenagers, who were allegedly shooting a toy gun and drinking alcohol, to police in San Mateo.
The missiles can be equipped with either conventional or nuclear payloads.

The spring selling season ended on a weak note while the median existing-home price climbed to a record high.
A proposed rule would limit reviews to impacts within the NRC’s legal authority and is open for public comment until Aug. 21.
A glimpse into the world through the lens of photography.
President Donald Trump filed an appeal of the new disbursement order the same day it was issued.
The U.S. president also said that the United States will give a license to Ukraine to manufacture Patriot interceptors.
Danish Prime Minister Mette Frederiksen said, ‘We are ready to defend every inch of NATO, including our own territory.’
Two people were charged with assaulting Border Patrol agents.
The subpoena also sought addresses and phone numbers, and included people who reviewed ballots and helped with the count. The judge called it unreasonable.
The president’s latest filing asks the justices to reconsider after they declined to hear his appeal of the $5 million judgment.
It marks the first visit to Turkey by a sitting U.S. president since President Barack Obama attended the G20 summit in Antalya in 2015.
The 72-hour holding center will be part of a larger deportation operation in Alexandria first opened under President Barack Obama.
Farmers will be able to submit lawfare complaints involving federal agencies on a portal run by the USDA.