Self-ruled island has complained that Beijing is hindering its efforts to secure the injections

Presumptive Democratic candidate previously said he would reveal his running mate at the beginning of August; selection must be made before party convention opens on August 17

Presumptive Democratic nominee has pledged to select a female running mate, with several US lawmakers and Obama's ex-national security adviser seen as favorites

7 current or former senators who called for colleague to step down say were wrong to do so, but Gillibrand says she has no regrets