U.S. intelligence agencies don’t think much of President Trump’s Muslim ban, according to a leaked national security document.

During her broadcast on Thursday night, MSNBC’s Rachel Maddow discussed the explosive contents of a document that Department of Homeland Security (DHS) employees leaked to her producers. Excerpts of the document show that, in regard to President Trump’s executive order banning immigration from several Muslim countries, the radicalization of immigrants typically happens several years after they enter the United States. This means that Trump’s rationale for prohibiting immigration from Muslim countries is without merit.

The document, which is titled, “Most Foreign-Born U.S.-Based Violent Extremists Radicalized After Entering Homeland,” shoots down the “extreme vetting” justification Trump gave after he issued his initial executive order that was later struck down by the courts. While DHS released the report, the document was assembled with the help of U.S. Immigration and Customs Enforcement, the State Department, Customs and Border Protection, the U.S. Citizenship and Immigration Center, and the National Counterterrorism Center.

“We assess that most foreign-born U.S.-based violent extremists likely radicalized several years after their entry into the United States, limiting the ability of screening and vetting officials to prevent their entry because of national security concerns,” Maddow said, reading from the document.

“There’s nothing they can set up at the border to tell you years down the road who might become a completely different and radical and violent person years from now because they haven’t been radicalized yet. So this tells us substantively, in terms of the substance of the matter, that the intelligence community thinks the Muslim ban is nuts,” Maddow continued.

Watch the segment below: