This should be completely separate from the Trump-Russia situation- but yes any tampering with fair elections should certainly be a federal offense. This isn’t partisan and it definitely shouldn’t be about going after one person, it should be about maintaining the integrity of US democracy. Simple as that.
HOWEVER- it is already illegal for a foreign nation to attempt to interfere with elections, and honestly we all really need to let the Mueller report go. It’s been a year, and millions of dollars. All it is doing now is hurting and dividing America, (and let’s be real all media coverage of Trump helps him). So let the dead horse rest.