"I was an amateur boxer in my youth, and I brought that fighting spirit with me to Washington", he said.
In a video posted to Twitter, the 83-year-old Utah senator said he was "deeply grateful" to serve as a senator, saying he has "always been a fighter" and now is looking forward to spending more time with family.
2012 Republican presidential nominee Mitt Romney just dropped his biggest hint yet that he plans to run for Senate in Utah this year.
Hatch, 83, has served in the Senate since 1977 and is now the longest serving Republican in the Senate.
Romney has been an outspoken critic of President Donald Trump and the president has also lambasted him. Republicans on that committee led the Senate effort to overhaul the tax system which passed last month, the only major legislative accomplishment of the GOP Congress.
It wasn't that much of an honor, though: An editorial accompanying the recognition said, among other things, "It would be good for Utah if Hatch, having finally caught the Great White Whale of tax reform, were to call it a career".
Sanders would not say if Trump would back Romney.
Last month, Hatch reveled in the spotlight as chairman of the Senate Finance Committee while shepherding a massive tax bill through the Senate - attention, friends and colleagues said, that made him lean toward running again.
First pics of 'SUPERMOON' over United Kingdom as it reaches its peak TONIGHT
The moon is set to reach its perigee, at a distance of 3.56 lakh km from the earth, at 3.34 am and will set around 7.54 am. The supermoon on January 31 is also known as the Blue Moon since it's the second full moon of January.
Utah is a great state for Romney and a bad one for Bannon, which means that the former White House chief strategist would be under little pressure.
After the election, Romney submitted himself as a candidate to be secretary of state in an excruciatingly public interview process.
Romney thanked Hatch in a statement on Facebook and said Hatch "has represented the interests of Utah with distinction and honour".
Brown, a liberal firebrand, said people know Republicans want to help the rich because it's "in their DNA".
His terms ends about a year from now. As the two senators talked over each other, Hatch said he was exhausted of Democrats' "bull crap".
But as the president prodded Hatch to stay, voices in his home state were urging him to go. During his time on the committee, the Senate has confirmed almost 1,900 federal judges, a majority of all federal judges that have served.
Hatch frequently wrote religious songs and recorded music in his spare time as a way to relax from the stresses of life in Washington.