Kamala Harris faces perhaps the most politically challenging moment of her vice presidency Friday when she heads to the U.S. southern border as part of her role leading the Biden administration’s response to a steep increase in migration. While in El Paso, she will tour a Customs and Border Patrol processing center, hold a conversation with advocates from faith-based organizations as well as shelter and legal service providers, and deliver remarks.

The vice president has faced months of criticism from members of both parties for declining to make the trip thus far and for her muddied explanations as to why.

Republicans have seized on the absence of both Harris and President Joe Biden from the border to paint the administration as weak on border security, seeking to revive a potent political weapon against Democrats in time for the 2022 midterm elections. With former President Donald Trump visiting the area less than a week after Harris, Republicans will be watching the vice president’s visit closely for fodder for further attacks.

While various administration officials have made multiple visits to the border, the absence of Biden and Harris has left some Democrats worried that damage already has been done.

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