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Philippe P. Dauman

Sumner Redstone seeks to dismiss lawsuit by Viacom CEO

Lawyers for media mogul Sumner Redstone on Monday filed a motion to dismiss a lawsuit in Massachusetts court alleging Redstone wasn't mentally competent when he removed two trustees of entities that control Viacom Inc. and CBS Corp.

Redstone's attorneys are asking the probate court in Canton to toss out the lawsuit, saying Redstone has not been deemed incompetent by a court or by medical doctors, the two conditions under which he could be deemed incompetent and his authority under the Sumner M. Redstone National Amusements Trust could be suspended.

The lawsuit was filed in Massachusetts because that's where the trust is administered.

The motion also seeks to require...