WASHINGTON — Vice President Kamala Harris’ campaign is planning to more aggressively attack former President Donald Trump in the remaining weeks ahead of the November election, a new phase aimed at trying to move the small number of undecided voters her way, according to five Harris campaign officials.

The change is driven, in part, by internal campaign data showing that sharper messaging against Trump could persuade some still-unsure Americans to support Harris, according to three of the campaign officials. The effort is set to include new ads and harsher language on the campaign trail that highlights Trump’s past actions and rhetoric that Harris officials hope will tip these voters away from backing the former president.

But emphasizing what Harris campaign officials view as Trump’s major vulnerabilities is seen as possibly one of the only ways to finally win over some voters who haven’t made up their mind in a static race that Democrats want to push in their direction.

 in two new ads this week: one referring to his time in office as “erratic, destructive, and divisive” and another that raises questions about his fitness for office given he is 78 years old.