The pundits say Harris is in the honeymoon stage. Needs to get herself known etc.
Trump is looking for an angle. Seems he has tried her smile but the main one seems to be immigration. She's changed it. Probably still needs to patrol the boarders but many arrive at official entry points. Trump says they overstay. Quick google
Combining deportations with expulsions and other actions to block migrants without permission to enter the United States, the Biden administration’s nearly 4.4 million repatriations are already more than any single presidential term since the George W. Bush administration (5 million in its second term).
Trump I'll deport 2m. Sounds like Biden may do better - or the policy will.
He's also trying the radical lefty method but uses different terms.