Sen. Joe Manchin Joseph (Joe) ManchinNames to watch as Trump picks Ginsburg replacement on Supreme Court Momentum growing among Republicans for Supreme Court vote before Election Day Gardner on court vacancy: Country needs to mourn Ginsburg 'before the politics begin' MORE (D-W.Va.) hit a former political opponent of Sen. John McCain (R-Ariz.) on Saturday after she said McCain should resign following his cancer diagnosis.

"In all the ways I measure good Senate colleagues (honor, class, integrity) Kelli Ward falls short. [People] like her aren't welcome in the US Sen," Manchin said.

In all the ways I measure good Senate colleagues (honor, class, integrity) Kelli Ward falls short. Ppl like her aren't welcome in the US Sen — Senator Joe Manchin (@Sen_JoeManchin) July 22, 2017

Ward said this week that "the medical reality of [McCain's] diagnosis is grim," and he should consider stepping down and having her take his place.

"Senator McCain has an aggressive brain cancer that is both devastating and debilitating. When the time comes that Senator McCain can no longer perform his duties in the Senate at full capacity, he owes it to the people of Arizona to step aside," Ward said.

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When asked if her name was being considered as a replacement, Ward responded: "I certainly hope so."

Manchin said in another tweet that "people like Kelli Ward are what's wrong with politics today. The people of AZ deserve representatives with dignity & decency."

People like Kelli Ward are what's wrong with politics today. The people of AZ deserve representatives with dignity & decency. — Senator Joe Manchin (@Sen_JoeManchin) July 22, 2017

McCain has made no suggestion that he will step down, and said in a tweet that he will be "back soon" to the Senate.