Overview

• Frank Luntz advises Trump to stop behaving like a 'petulant child' and focus on voter concerns.
• Luntz's comments come amid Trump's controversial remarks and declining poll numbers.
• Recent polls show Vice President Harris leading Trump nationally and in key battleground states.
• Luntz warns that Harris could extend her lead if Trump continues his current approach.
• Republicans push for a policy-focused campaign to counter Harris's momentum.