Sorry, I don't mean to imply it's universally supported, but there is support on both sides of the aisle. But the article you linked does indeed say it has had bipartisan support :)

> When Sens. Ron Wyden, D-Ore., and Dan Coats, R-Ind., introduced a bipartisan tax reform bill in 2011 that included a return-free plan called "Easyfile," Norquist blasted it.

If it were universally supported, this wouldn't have happened

https://www.propublica.org/article/congress-is-about-to-ban-...