In the Captain America movie we learn that the current [MCU] President was near the same blast that created the first Hulk. Yadda yadda, the President becomes the Red Hulk and ends up in jail. Harrison Ford plays the President and he’s sorrowful for what happened and Captain America is also sad.

No, the president (a formerly retired US army general named Ross who had been hunting the Hulk for years) is revealed to have holding a character from the first Hulk movie in prison for years and forcing that character (Samuel Sterns, AKA The Leader) to use his incredible genius to do two things: 1 - help him with his heart condition (which was what had forced his retirement in the first place) and 2 - help him win the presidency. It is then revealed that The Leader, instead of simply curing his heart condition, has been seeking revenge by dosing him slowly with a substance that has turned him into another Hulk; this one red.

The Leader then instigates a series of events which politically embarrass Ross and put him under increasing stress in the hopes of triggering a public hulkout which will ruin him. In this, he succeeds, and Captain America is forced to fight the Red Hulk without killing him. Cap eventually succeeds in calming him down, at which point he reverts to Ross and his promptly imprisoned in super-jail.