By Shashwat Chauhan and Kanchana Chakravarty (Reuters) -Futures tied to Wall Street's main indexes fell marginally on Tuesday as investors awaited commentary from Federal Reserve officials through the day to assess the impact of U.

US stock futures wavered after investor optimism largely persisted for another day despite growing warnings that relief over trade developments could be short-lived.

U.S. stock futures point to a lower open, a day after stocks made a comeback to close higher despite Moody's stripping the U.S. of its top AAA rating.

The S&P 500 is now just 3% from its record high despite continued uncertainty around the impact of tariffs on the economy.

Futures are pointing to a mixed open for major U.S. stock indexes on Tuesday as the S&P 500 aims to extend its winning streak to seven consecutive sessions.

At least seven Fed officials including St. Louis Fed President Alberto Musalem are expected to speak later in the day. "The hawks are expected to support the current 'wait-and-see' approach, with the doves most likely highlighting the recent soft inflation report and the lingering uncertainty from tariffs,

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Futures on Wall Street are currently pointing to a negative start to Tuesday's trading session, even as investors brushed aside concerns arising from the Moody's downgrade. Monday's session saw the resultant gap-down from the downgrade being swiftly bought into,