Why is Joe Biden angry that America has no control over guns and wants a gun reform. Isn't it up to him to make those changes as he is the president?

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My heart goes out to all the victims and their families. Horrible and senseless.

Although I'm from the UK I have a lot of family in United States.

Isn't it up to biden to make these changes on gun laws?
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Guys, im not American and I don't follow us politics in great details and religiously so bear with me but thanks for the information. And of course I am not for dictatorship lol
Why is Joe Biden angry that America has no control over guns and wants a gun reform. Isn't it up to him to make those changes as he is the president?
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