Brazil denies visas to U.S. officials who aimed to impugn electoral system (washingtonpost.com)

Good on them. The US trying to export it's own expertise in undermining confidence in the electoral / democratic process is one of the worst things it could do, amongst a litany of bad things it's currently doing.

According to the Economist Democracy Index, Brazil is a more democratic country than the USA.

https://en.wikipedia.org/wiki/The_Economist_Democracy_Index