Harris has returned to Washington after traveling to Guatemala and Mexico
Kamala Harris said it was 'short-sighted' to focus on the border rather than the root causes of migration
She also said she wasn't interested in 'grand gestures'
She bristled in an interview, saying: 'And I haven't been to Europe'
The White House said she 'may' go to the border
At her final presser, she said 'Listen, I've been to the border before and I'll go again'