The Justice Department’s investigation of efforts by Donald Trump and his advisers to overturn the 2020 election results is barreling forward on multiple tracks, according to people familiar with the matter, with prosecutors focused on ads and fundraising pitches claiming election fraud, as well as plans for “fake electors” that would swing the election to the incumbent president.

Each track poses potential legal peril for those under scrutiny, but also raises tricky questions about where the line should be drawn between political activity, legal advocacy and criminal conspiracy.