U.S. futures trimmed earlier losses to hover around the flatline on Tuesday, after the S&P 500 and Nasdaq reached new record highs in the previous session. Investors are on the lookout for new market drivers amidst an ongoing political deadlock in Washington. Efforts to pass funding proposals from both the Democratic and Republican parties failed for a fifth time on Monday, resulting in the federal government shutdown continuing into its seventh straight day. Among megacaps, premarket activity showed mixed results: Nvidia rose by 0.4%, Microsoft by 0.1%, Amazon by 0.2%, Meta by 0.3%, and Alphabet saw gains, while Broadcom remained stable. In contrast, Apple declined by 0.4%, Alphabet by 0.4%, and Tesla by 0.7%. Notably, Trilogy Metals experienced a surge of over 205% in premarket trading following the announcement that the White House plans to acquire a 10% stake in the Canadian company.