Presidential hopefuls vying for a spot on Illinois’ March 19 primary ballot had to submit their nominating petitions to the State Board of Elections on Thursday or Friday. The loyalty pledge is not required but is a long-standing tradition that candidates undertake as part of that paperwork.
Did he do it last time or skip it? Not that it matters to his base either way.
Edit: he signed it in 2016
Also: “The oath remains enshrined in Illinois law but has been struck down as unconstitutional on free speech grounds in federal courts.”