First of course, it’s disrespectful to make insinuations to a sovereign country about whom they may vote into office.

Secondly, Trump doesn’t have authority to give loans.

He’s probably trying to deceive Argentinian voters with false hope of generous loans (which have to be paid back, I should note).

However, in the US, financial decisions are made by Congress. Certainly on the scale of tens of billons. The president has discretion to move far smaller sums.