The Trump administration has directed immigration agents to check if migrants have registered their names and personal details in an online database to enhance the president’s wide-ranging deportation campaign.

If migrants fail to register or don’t carry proof of their registration with them, Immigration and Customs Enforcement agents are being told to “treat the alien’s case as an immigration enforcement priority” and to “refer the case to the US Department of Justice for criminal prosecution,” according to the memo.

An ICE source said they believe many illegal migrants won’t register, becoming prime targets for arrest and deportation.

Trump signed an executive order — Protecting the American People Against Invasion — on his first day back in the White House, paving the way for the registry that now requires migrants to submit personal information or face fines and arrest. 

Illegal migrants ages 14 and older must submit fingerprints and home addresses to the registry or potentially face criminal prosecution or deportation, according to US Citizens and Immigration Services. 

“Most aliens in the United States have already registered, as required by law,” according to USCIS. “However, a significant number of aliens present in the United States have had no direct way in which to register and meet their obligation under INA [section] 262.

“In order that unregistered aliens may comply with their duty under INA [section] 262, USCIS is establishing a new form and process by which they may register. No alien will have an excuse for failure to comply with this law.”

Migrants who don’t register could face fines of up to $1,000 per day, Department of Homeland Security Secretary Kristi Noem told The Post Tuesday.

They could also face up to six months in prison, the Wall Street Journal reported on Tuesday. 

“Everyone should know that because we’re enforcing the Alien Registration Act, if you’ve been here longer than 30 days and haven’t registered with the government, we are now coming after you criminally,” Noem warned while joining an ICE raid in Phoenix.

A federal judge ruled Thursday that the Trump administration can proceed with the registry requirement, while enforcing the consequences on those who don’t register after a handful of nonprofit organizations tried to block the registration requirement from going into effect.

“Plaintiffs have not shown that they are likely to succeed on the merits,” DC US District Court Judge Trevor McFadden ruled Thursday. “They have failed to demonstrate that they have standing to bring this suit.”