Former Milwaukee Sheriff David Clarke is joining America First Action as a senior adviser and spokesman, the pro-Trump super PAC announced Tuesday.

"Having spent a lifetime in law enforcement — protecting and serving his community and fighting for justice and the Second Amendment — Sheriff Clarke doesn't just believe in making America safe again; he's devoted his life to it," America First Action president Brian Walsh said in a statement.

Clarke, who endorsed President Trump in a speech at the Republican National Convention, resigned last week from his position as sheriff of Milwaukee County, Wis.

"[Joining America First Action] gives me the chance to do what I love most — promote President Trump's agenda, including his fierce support for the American law enforcement officer, and ensure that the will of the American people who got President Trump elected is not derailed by the left or the self-serving Washington establishment," Clarke said in a statement.

Trump's former campaign manager Corey Lewandowski joined the super PAC in mid-August.