Washington (CNN) In an interview with NBC that ran Monday morning , Ivanka Trump was asked a simple question: "Do you believe your father's accusers?"

That's a totally fine answer for a daughter to give! Makes perfect sense! Except ...

Ivanka Trump isn't just a daughter. She's also a White House senior adviser. She has an office in the building. She is seen as one of a very small group of voices the President listens to.

Any other adviser at such a senior level and with such perceived influence over the President would be expected to face just these sorts of questions. After all, Trump stands accused by more than a dozen women of sexual harassment and assault over the course of decades. There is also the question of a $130,000 payment by Trump's personal attorney, Michael Cohen, to a porn star named Stormy Daniels who alleged that she had an affair with Trump in the mid-2000s.

Given the #metoo movement, the number of high-profile men who have either admitted to or faced serious accusations about sexual assault or misconduct and the accusations Trump himself faces, it's entirely reasonable to ask a senior aide to the President about it all.

And, in her I'm-my-father's-daughter answer, Ivanka is trying to have it both ways.

On the one hand, she wants to be the face of the US delegation at the closing ceremonies of the Winter Olympics in PyeongChang, South Korea. And a regular participant in all manner of White House policy initiatives and pushes. That's the sort of stuff that major players in a White House get to do.

On the other, she wants to be just Donald Trump's daughter. So, it's "inappropriate" to ask a daughter questions about her father's behavior.

Which, of course, is not how any of this works.

The inability of anyone to play the dual role of official adviser and blood relation is why, in the late 1960s, Congress passed an anti-nepotism law in the wake of John Kennedy's appointment of his brother, Bobby, as attorney general.

"A public official may not appoint, employ, promote, advance, or advocate for appointment, employment, promotion, or advancement, in or to a civilian position in the agency in which he is serving or over which he exercises jurisdiction or control any individual who is a relative of the public official."

How did Trump get around this statute to hire not just his daughter, Ivanka, but her husband Jared Kushner? Because "agency" in the law above is interpreted to not include the White House. So, Trump couldn't make Ivanka the Treasury Secretary. But, according to the current interpretation of the law, he is fine with having her in a senior role within the White House.

Which, OK (I guess?), legally speaking.

But, as a practical matter, it simply doesn't work -- as this latest Ivanka response to NBC's question makes clear. You can't be both a daughter and a senior presidential adviser. The rules of engagement -- and response -- that cover one simply don't apply to the other.

This isn't a Republican or Trump problem alone. Bill Clinton's decision to put Hillary Clinton in charge of a task force charged with overhauling the nation's health care system created many of the same concerns.

Past history on this is instructive. Unless Congress updates the anti-nepotism language to clear up the legal questions as to whether it applies to the White House, we will have this Ivanka Trump situation again sometime -- and it won't end any differently (or better).