纳斯达克综合指数下跌2%，特朗普总统坚守对欧盟关税立场

The evidence provided by the primary sources overwhelmingly supports the statement. Multiple high-authority sources, including ABC News and Yahoo Finance, directly confirm the core claims: that the Nasdaq Composite fell by approximately 2% (one source specifies a 2.3% drop, while others state it was "over 2%") and that this drop was a direct market reaction to President Trump's tariff threats against the European Union. A news channel's social media post further corroborates these specific details.Additional sources from major news outlets like CNBC, CBC, and NBC News consistently report a major market plunge for the same reason, reinforcing the overall narrative. Furthermore, two sources indirectly strengthen the claim by describing the inverse event: the market, including the Nasdaq, rallied after President Trump reversed his tariff stance. This demonstrates a clear cause-and-effect relationship between the tariff stance and the market's performance.There is no conflicting evidence among the relevant sources. The minor variation in the reported percentage fall ("2.3%" or "over 2%") does not contradict the statement's claim of a "2%" fall; rather, it specifies it with greater precision. The statement is an accurate summary of the event described in the sources. The consistency, authority, and directness of the supporting evidence lead to a high-confidence assessment that the statement is true.