'We're on it': US tries to quell concerns over reported drone sighting over New York and New Jersey - US wants to supply Kiev with 'massive quantities of weapons' before Biden steps down - US House of Representatives approves $884-billion defense budget - US trade office starts probe into Nicaragua human rights and labour abuses - 'Top priority': US renews push to find Austin Tice after al-Assad toppled - BlackRock's Boivin Says Global Bonds Favored Over US Treasuries - Biden says 'US is all in on Africa' during Angola visit - Biden says 'US is all in on Africa' during Angola visit - US Postal Service touts timely delivery of mail ballots despite concerns from election officials - US assumes UNSC presidency for one month