Remember, we don't have a Federal Election for President; we have 51 State Elections. They can't impose rules on who gets to run.

Additionally, there's no Constitutional requirement for financial disclosure.

write any law they wish.

The Court may declare it unconstitutional but they can pass whatever they want.

where the President has to sign the law. So no, one simple action by Congress could not have prevented this disaster.

And, as already mentioned, presidential elections are conducted by the States, not the Feds. The Constitution sets the qualifications for President. Congress does not determine who is allowed on State ballots, the States do.

The power still rests in the hands of the Congress.

You realize that the States are not even required to have a popular election for the Office of President?

Never mind, I don't think we are going to work this out.

We can get into "state rights" arguments about numerous issues, past and present.

If so, there is nothing "simple" about amending the constitution.

Although every law is open to constitutional interpretation.

could have just passed a law requiring every candidate running for President to be a Democrat.

Easy peasy. Right?

Democrats did not have a majority to pass anything.

Funny, I remember when Pelosi was SotH and Harry was the Senate Majority Leader. How did that happen?

??? There was no debate about "finances" or "taxes" until Trump came along.

that required all candidates for President to be a Democrat?

Or why can't the current Republican Congress pass a law requiring all candidates for President to be a Republican?

How would that be different from what you suggested in your OP?

An irrelevant diversion.

It's sad.