In a statement on his website, he said he was running with the goal of improving how Washington handles spending and "fixing" the Affordable Care Act.
"As the primary process gets underway for both parties, we look forward to contrasting our fresh, bold Republican vision for the future with the Democrats' retread message of the job killing policies of Pelosi and Schumer". "We've seen what's happened in other races".
"I love the people of our state of Tennessee, and we need and deserve something better than we're getting in Washington", the former Nashville mayor said in a new video.
On Wednesday, U.S. Congressman Marsha Blackburn released a statement surrounding unconfirmed reports of Bredesen's run, calling his views "out-of-touch with Tennessee values". Corker has announced that he does not plan to run for re-election in 2018 after a series of high-profile spats with President Donald Trump.
Snow warning for Donegal comes into force later
Road conditions will be in a poor state across the country and motorists are advised to be vigilant for ice and to slow down. Saturday is expected to be a mostly dry but very cold day with varying cloud and sunny spells.
Bredesen, who served two terms as governor from 2003 to 2011, formally announced earlier today in a 2-minute video that he is seeking the seat being vacated by incumbent U.S. Sen.
Bredesen ran as a moderate Democrat in his first gubernatorial race, and his successful reputation as Nashville mayor and business background allowed him to run with unusual strength in heavily Republican areas of the state.
But Bredesen's entry in the Volunteer State gives the party another pick-up opportunity along with Arizona, where GOP Sen.
Sen. Bob Corker's (R-TN) decision to retire has created a slim opening for Democrats in the state.