Lawmakers Make Their Fortunes Investing Bribe Money in Insider Trading
I think you can do it via Quiver Quantatative, but there's some sort of fee structure. https://www.quiverquant.com/congresstrading
Theoretically, there are reporting requirements and the trades are public knowledge. Don't know where that information lives though.
You can go through publicly available government contracts like those used by FEMA, and see what corporations are getting what money. I like to cross reference the boards of the companies with congressional members and invest in ones where they have Congress people from both isles.
There's a lot of them.....