Donald Trump’s allies have launched a super PAC that will seek to oust Rep. Thomas Massie, a Kentucky Republican who opposed the president’s domestic policy bill and criticized his strikes on Iran’s nuclear facilities.

The Kentucky lawmaker says the president’s threats over Iran and tax-bill stances aim to keep other Republicans in line.

Kentucky's U.S. Rep. Thomas Massie said attacks from fellow Republican President Donald Trump show he's worried about congressional opposition.