A half right turn is
45 or forty-five
Say me out loud, I’ll get stronger
fortify, when spoken, which is to make stronger. Credit to Stiv.
Rearrange me, It will just make me larger
forty-five anagrammed is over fifty, per DEEM's What number is that ? Asks Grandpa
I’m triangular and angular
45 is a triangular number, a 45 degree angle is acute and common as it's half a right angle
Can be turned into one, Left a whisper, While staring down
TBD
Had a groovy body, Needle very small
a single's record, named from its rotational speed of 45 rpm
I was briefly with Jordan
after retiring from the Bulls, Michael Jordan wore the 45 jersey for the Birmingham Barons
Though more in Football
a football match is two halves of 45 minutes each
Just look at me, I’m a weapon with a horse
.45 is a common gun calibre, as in the 45 Colt which is a horse
Guess who I am, Do you have the nerves?
45, and nerves to post a partial
Hint 1
I am associated with Trump too - the 45th president of the USA
Hint 2
Inspired by a great puzzle by @hexomino - the super An untouchable time traveller