SAN FRANCISCO, Aug 6 (Reuters) - U.S. Republican Senator Tom Cotton sent a letter to Intel's (INTC.O) board chair on Wednesday with questions about the chipmaker's new CEO Lip-Bu Tan's ties to Chinese firms and a recent criminal case involving his former company Cadence Design (CDNS.O).

Republican Sen. Tom Cotton wrote a letter to Intel’s board with questions about CEO Lip-Bu Tan’s ties to Chinese firms.

Intel's stock tumbles after President Trump said the CEO must resign for allegedly being tied to the Chinese Communist Party.