Unfortunately, at least here in the US, you can.

All you have to do is loan your campaign money at interest, and basically every federal legislator does it. Hillary Clinton famously did this during her 2016 campaign, back when this sort of thing actually drummed up reporting in the news.

And you can get people to bribe you even more (and Donald loves this) by having your billionaire buddies buy thousands of copies of your book, or stay at your hotels, or whatever. Mitch McConnell got his own businesses federal contracts and avoided an ethics probe by putting his wife in charge of said businesses.

Nancy Pelosi has famously built a 100+ million dollar stock portfolio by insider trading legally.

There are so many ways to grift legally as a federal legislator.