Homeland Security knows of at least 660,000 illegal immigrants at large in the U.S. with criminal records, including 13,000 convicted killers, nearly 16,000 sex assault convicts and 56,000 involved with dangerous drugs.

Thousands more migrants have been charged but not yet convicted of those and other crimes.

They are part of U.S. Immigration and Customs Enforcement’s so-called “non-detained docket,” a list of more than 7 million unauthorized migrants that ICE is supposed to be monitoring as they roam free in the U.S.

ICE provided the data to Congress and the House Homeland Security Committee released it Friday, just as Vice President Kamala Harris was set to land in Arizona for her first visit to the border in more than three years.

“It may be shocking to hear that the Biden-Harris administration is actively releasing tens of thousands of criminal illegal aliens into our communities, but their own numbers conclusively prove this to be the case,” said Rep. Mark Green, chairman of the committee.

Former President Donald Trump, on social media, said the new data should force Ms. Harris to cancel her border appearance.

“Kamala should immediately cancel her news conference because it was just revealed that 13,000 convicted murderers entered our country during her three-and-a-half-year period as border czar,” he said.

In reality, they came over the course of decades.

ICE said that as of July 21, 435,719 migrants on its docket had criminal convictions, and 26,847 have unresolved criminal charges.

That included 13,099 people convicted of homicide and 1,845 with pending homicide charges.

It also included 6,567 migrants convicted of obstructing the police; 10,031 convicted of robbery; 15,811 convicted of sexual assault; 13,423 convicted of weapons offenses; 56,533 convicted of involvement with dangerous drugs; 62,231 convicted of assault; 2,521 convicted of kidnapping; and 792 convicted of arson.

Jessica Vaughan, policy studies director at the Center for Immigration Studies, who has been tracking the data over the years, said the latest numbers mark a substantial increase compared to the last decade.

She said it’s a result of the Biden administration weakening interior immigration enforcement.

“Most deportations that happen from the interior are criminals, so when you cut the number of deportations from the interior​, you’re allowing criminals to stay here,” she said.

Acting ICE Director Patrick Lechleitner, who provided the data to Congress, said they do try to hold serious criminals such as convicted murderers, but weigh each case based on perceived risk to the public and risk of flight.

“ICE takes other factors into consideration as well, including when a noncitizen has a serious medical condition, is the primary caregiver of minor children, or other humanitarian considerations,” he said.

He didn’t mention it, but some of the serious criminals at large in the U.S. are likely due to the Supreme Court’s 2001 ruling in the Zadvydas case that imposed a limit on how long migrants can be held in immigration detention. The justices ruled that if deportation didn’t seem likely, a migrant couldn’t be held indefinitely.

Countries such as China and Cuba are notoriously bad at cooperating in taking back their criminal migrants, meaning that ICE often has to release those criminals.

The government has penalties it can impose on those other nations to try to get better cooperation, such as withholding travel visas from government officials and their families or even a broader segment of those countries’ populations.

The Trump administration regularly deployed that power but there are no indications the Biden administration has employed it with any frequency.

• Stephen Dinan can be reached at sdinan@washingtontimes.com.