Prosecutors with the U.S. Attorney’s Office for the Southern District of New York asked U.S. District Judge William Pauley III Friday to sentence Michael Cohen, President Donald Trump’s former personal lawyer, to a “substantial term of imprisonment,” to be tempered only slightly by Cohen’s willingness to talk to members of the Special Counsel Robert Mueller III’s team.

In their sentencing submission, prosecutors from Manhattan U.S. Attorney Geoffrey Berman’s office acknowledged Cohen’s help, but strongly urged the court not to mistake Cohen’s efforts for those of a traditional cooperator. The document was signed by Deputy U.S. Attorney Robert Khuzami, who is piloting the case for the Southern District as Berman recused himself from the matter.