When President Trump announced a new ban on transgender people serving in the military late Friday, it was somewhat of a surprise — Defense Secretary Jim Mattis had reportedly recommended in February that Trump allow transgender people to serve. It turns out that Vice President Pence and some of the country’s most prominent anti-LGBTQ activists had a role in reversing the outcome, which explains why the report explaining the decision is rife with anti-trans junk science.

Slate’s Mark Joseph Stern reported Friday night that, according to multiple sources, Pence played “a leading role” in creating the report, along with Ryan T. Anderson of the Heritage Foundation, which has been dubbed “Trump’s favorite think tank,” and Tony Perkins of the Family Research Council (FRC), an anti-LGBTQ hate group. Both Heritage and FRC praised the report Friday. According to Stern’s reporting, it was true that Mattis favored allowing transgender military service, but Pence “effectively overruled” him.

A separate source independently confirmed to ThinkProgress Saturday that Pence was involved, characterizing him as forming his own ad hoc “working group,” including Anderson and Perkins, separate from the panel of experts Mattis had assembled. Though it bears Mattis’ signature, the report released Friday appears to reflect the findings of Pence’s working group and not the committee report that Mattis submitted to Trump last month. Mattis’ original document was not currently publicly available at the time of the recommendation, but it was widely reportedthat Mattis favored an inclusive approach that resembled what had originally been proposed by Defense Secretary Ash Carter under President Obama in 2016. His February recommendation, also released Friday, jibes with the new report, contradicting reports at the time.

How exactly Pence overruled Mattis’ recommendation over the past month the source did not know. But his working group’s influence is apparent. Read more via Think Progress