Wall Street opens lower as Apple falls 2% on old iPhone sale ban in China

Wall Street continues to be dogged by signs of cooling growth and worries that escalating tensions between the United States and China could scuttle their fragile trade truce

US equity futures fell in a volatile session on Monday, with a drop in Apple Inc's shares curbing the market's attempts to stage a bounce back from its worst week since March on worries over global growth and the China-US trade war.

After hitting six-month lows earlier in the session, stock futures briefly turned higher, which appeared to coincide with British Prime Minister Theresa May's abrupt decision to pull a parliamentary vote on her Brexit deal.

But that bounce was short-lived as Apple fell 2 per cent in premarket trading after Qualcomm Inc said it had won a preliminary order from a