Mick Mulvaney and Betty McCollum are from different parties
and disagreed on 75
percent of votes in the 115th Congress (2017-18).
But they didn't always disagree.
Out of 4 votes in the 115th Congress, they agreed on 1 vote.
Here is the vote they agreed on
Correction (Nov. 15, 2019): This page originally included all votes on passage of a bill under the "Major Votes" category. It now only includes votes designated as major by ProPublica.