Vice President Kamala Harris plans to visit the U.S.-Mexico border during a campaign stop in Arizona on Friday, a source familiar with the plans confirmed to Scripps News. Immigration is one of the most important issues to voters in this election cycle and a potential vulnerability for the Democratic presidential nominee.

Mexico border while in Arizona on Friday, according to a source familiar with the discussions, as Harris tries to close the gap with former President Donald Trump on the issue of immigration. Details of the visit – which CNN first reported Monday that campaign officials were weighing – are still being sorted.