A Republican congressman vying to unseat Democratic Sen. Mary LandrieuMary Loretta LandrieuSenate GOP rejects Trump’s call to go big on gun legislation Project Veritas at risk of losing fundraising license in New York, AG warns You want to recall John McCain? Good luck, it will be impossible MORE announced Thursday that his unmarried teen daughter is pregnant, according to multiple reports.

"Earlier this year, Laura and I learned we will become grandparents this summer," Rep. Bill CassidyWilliam (Bill) Morgan CassidyTrump has not invited Democrats, media to state dinner: report Republicans have a long way to go toward fully repealing ObamaCare Senators press administration on mental health parity MORE, a medical doctor from Baton Rouge, said in a statement to NOLA.com/The Times-Picayune late Thursday.

"Our children have been the greatest blessing of our lives and we welcome our grandchild as a joyous addition to our family," he continued. "Our daughter now faces a more challenging future than her peers. She has our unconditional love and support."

The announcement comes as Cassidy is considered the GOP leading contender challenging Landrieu in a closely-watched midterm race.

Landrieu is one of the most vulnerable Democrats running for reelection.

Cassidy's daughter is a rising senior at a high school in Baton Rouge.