Trump refuses to pay Giuliani's legal defense bills for actions he undertook on Trump's behalf in both 2016 (Ukraine coersion scandal) and in 2020/21 (trying to overturn an election Trump legitimately lost) as it will make him look bad.
"Trump aides have been clear they see no mechanism for paying Giuliani’s legal bills that isn’t problematic for Trump, and they think Giuliani took actions a lawyer should have known were problematic, even if the client wanted it." - Maggie Haberman, NYT Aug 1/21