Wall Street's main indexes opened lower on Monday after President Donald Trump rekindled worries about the ramifications of a global trade war by introducing new tariffs, while focus remained on the Fed's monetary policy decision later this week.

Wall Street has clawed back losses incurred after President Donald Trump imposed global tariffs a month ago, capping the longest winning streak in two decades for US stocks.Shares saw gains for the ninth day in a row for the first time since 2004 after a better-than-expected jobs report and rising hope of US-China trade talks.