Can Senator Van Hollen legally be allowed to run for President in 2028?

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6. Both his parents were US Citizens, right?

So by any normal reading, he is eligible. (But then, our opponents are not normal, so there's that.)

https://www.history.com/articles/what-are-the-qualifications-to-be-president-of-the-united-states

The Founders universally supported a citizenship requirement, and there wouldn’t have been any confusion about what it meant to be a “natural born” citizen. That language was common in 18th-century British law, which recognized all children born to British parents as “natural-born subjects,” even if they were born outside the British Empire.

Note that the framers were careful to include the clause “​​at the time of the Adoption of this Constitution,” to waive the “natural-born” requirement for prominent delegates like Robert Morris and James Wilson, who were born to British parents outside of the American Colonies (England and Scotland respectively).