Romney is worried that with McCain being ill, Trump might lose a major thorn in his side. Romney to the rescue! If/when McCain passes, Romney will step into his shoes and harass Trump at every opportunity. [I know one is AZ and one is Utah. Doesn’t matter. Any senator can be a pain; it just takes bitterness, meanness and pettiness.]
“Any senator can be a pain; it just takes bitterness, meanness and pettiness.”
You forgot to add jealousy.