Pennsylvania Democratic Rep. Madeleine Dean is considering a 2028 run for the U.S. Senate, a move that could put her in a primary contest against incumbent Sen. John Fetterman.

“I’m going to be considering it,” Dean said in an interview Tuesday when asked about a potential candidacy. She did not offer a timetable for a decision and said she would need to discuss the possibility with her family.

A campaign would bring Dean and Fetterman together again on the ballot. Dean lost to Fetterman in the 2018 race for lieutenant governor, but won election to the U.S. House later that year.

Dean said her thinking reflects concerns about Fetterman’s personal circumstances as well as his record in office.

“I have been concerned about, really, two things, which is his family and his health … and am very disappointed in his activity as a senator and in his votes,” she said.

Fetterman, who was elected to the Senate in 2022, has faced declining popularity among members of his party’s base. Critics have pointed to his prolonged absences from legislative business and his support for the Iran war, a position at odds with much of the Democratic Party.

Dean may not be the only Democrat weighing a challenge. Rep. Chris Deluzio of Pennsylvania is also giving a Senate run “serious thought,” raising the prospect of a crowded primary field.

Dean emphasized that she was taking the decision seriously and noted that she had come to know and like Fetterman and his wife during the 2018 campaign.

“When I say consider, nothing is lighthearted,” she said.

For now, Dean has stopped short of announcing a campaign, leaving open whether the former rivals will meet again in 2028.