evidence: Replacing Biden on ticket would be 'unlawful' in some states, Johnson claims. Experts disagree. [...] Johnson, R-La., told ABC "This Week" co-anchor Martha Raddatz that it would not be possible for some states to switch out Biden for another candidate ahead of the presidential election in November. [...] Election law expert Richard Hasen wrote that there is "no credence" to the notion that the Democratic Party could not legally replace Biden on the ticket, as he is not the nominee yet -- the nominating process generally takes place during the Democratic National Convention.