(My instincts scream: no. At least not by tweeting...)
The role doesn't have that de facto power, but he could enact things that effectively make it the de jure law by forbidding US companies doing business with the US federal government from using anything that sources some or all of its goods and services that have a dependency on a Chinese supply chain. The anti-BDS rules that some states have is what I would consider to be the precedent here .
Given that the president also has frequent campaign rallies, he can persuade voters to boycott companies that again source components from a Chinese supply chain. His official campaign baseball caps aren't made in China though some unofficial ones are sold on Amazon that come from China . I guess the same would go for US flags.
He could declare a 10,000% tariff on iPhones if he wanted.
According to http://www.dogsofthedow.com/histogram-m.htm "95% of the time the Dow has a daily change between ±2.1%; and 99% of the time the Dow has a daily change between ±3.2%."
The site fivethirtyeight.com has a page that shows approval polling of presidents since Truman overlaid with Trump. The only President significantly more unpopular than Trump at this point in their Presidency was Carter. The only Presidents who were roughly as unpopular at this point, were Obama and Reagan, oddly enough, both of whom of course were re-elected.
But I think those facts fail to capture what is unique about Trump's polling. Every President since Truman, excepting Trump, has had high points where they had well over 50% approval. Trump's polling is uniquely nearly flat since the beginning of his presidency. He's currently about 42% approve, 54% disapprove, and it's getting worse, but this is actually not the worst rating he's had - late 2017 was worse. In other words, there seems to be no trend.
> The rest of the world want to emigrate to US if they could.
I don't think this is true any more. All the people travelling I know are heading to Europe - no one wants to go to the US, because of all the train wrecks happening politically, and the perceived hassle of getting through US border security.
Well, “was a president”; horrible is subjective, but the present tense is objectively incorrect.
> that let China stole all the jobs and factories from US
Ludicrous hyperbole, at best.
> lied about extramarital affairs
> and associated with the rapist Epstein.
Also like Trump.
> Trump talks crap about alot of things, but that's it
Er, no. See above, for just a couple of things you've overlooked.
> NOBODY stood up to China until Trump came along.
Others have, but not with as much short-term harm to the US. The long-term payoff from the high-cost strategy is dubious.