A group of Democratic senators are calling for an investigation into White House security clearance procedures following the resignation of a top aide who has been accused of domestic abuse.

Democratic Sens. Richard Blumenthal (Conn.), Elizabeth Warren Elizabeth WarrenBiden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon MORE (Mass.) and Mazie Hirono Mazie Keiko HironoDemocrats unveil plan declaring racism a public health issue Overnight Defense: US, Russia trade blame over Syria incident | Pentagon calls out China's 'counterproductive' military exercises, missile test | Democrats press Esper on COVID-19 response Democrats press Esper on 'concerning' rise in Pentagon's COVID-19 cases MORE (Hawaii) sent a letter to Wayne Stone, the acting inspector general for the intelligence community, requesting an investigation into the administration’s process for granting security clearances.

The letter questions the White House’s “apparent low and inconsistent threshold” for granting clearance, and specifically points to what the senators call a “failure to seriously vet senior Trump Administration officials — including Jared Kushner Jared Corey KushnerAbraham Accords: New hope for peace in Middle East Tenants in Kushner building file lawsuit alleging dangerous living conditions Trump hosts Israel, UAE, Bahrain for historic signing MORE, Michael Flynn, and Rob Porter.”

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Porter, who announced his resignation on Wednesday, had not been granted full security clearance while at the White House, reportedly after the FBI was made aware of the allegations and a protective order from one of his ex-wives.

“Members of the Senate have sent several requests for information to the administration seeking clarification on the security clearance review process," the letter read. "We are concerned over the apparent low and inconsistent threshold the Trump White House uses for obtaining an interim security clearance.”

A group of ranking Democrats from three powerful House committees sent a similar letter in January seeking information specifically about senior White House adviser and Trump son-in-law Jared Kushner, after it was reported that he was still using a temporary security clearance.