What do you mean by "fortified"?
Discussion
US mounted a pressure campaign to ensure Lula won & result could not be challenged
FT Article on the subject is paywalled, here's a reddit thread on it: https://www.reddit.com/r/brasil/comments/14fac0v/the_discreet_us_campaign_to_defend_brazils/
That's what happened in the last U.S. election as well...