Where is the FBI in the Constitution?

This argument comes from a well-educated and experienced woman; nevertheless, it's very odd.

Where is my Congress? This is the urgent question posed by these outrageous attempts by the president to subvert the constitution.... Congressional Republicans who stick by Trump and protect him will be remembered as the villains of Washington’s unfolding drama. They are the ones enabling an epic White House end run around the constitution.

What does the Constitution say about the relationship between the FBI and the President? Nothing, since the Founders would never have contemplated establishing an organization like the FBI. The Constitution doesn't even mention the Attorney General, although that office is nearly contemporaneous: George Washington signed the law into effect creating the office. That law says that the President shall choose the Attorney General, provided that the Senate confirms him; it does not give the Attorney General independence from the Executive branch, nor divide his office between the Executive and the Legislature.

The FBI works for the Attorney General, who works for the President. It's an executive department, and what the Constitution actually does say about the Executive Branch is that its power is invested in a President. Though by law Presidents have to run certain appointments by the legislature, usually the Senate, that does not mean that those appointees draw their power from Article I. They're Article II officials, exercising delegated authority.

So what, exactly, is the subversion of the Constitution that is supposed to be taking place? If the legislature wants to investigate and/or impeach the President, they have Article I authority to do that. It's not obviously a power that is wisely invested in an Article II bureaucracy in any case. Nor would I want the Constitution to set up an 'independent' police agency that could not be constrained by elected officials; especially not a secret police.

The author seems to want exactly that.

As the Republicans continue their campaign to discredit the FBI, it’s important to remember a piece of history. Without Deep Throat, the Washington Post’s secret source, the Watergate scandal might never have been exposed. Deep Throat, we learned in 2012, was Mark Felt, the No2 official at the FBI.

This is meant to be the model of what right looks like? Oath-breaking leaks from the secret police, protected from accountability by un-elected journalists? Even if it happened to work out well one time, it's hardly a model I'd invest much faith in.