“When it comes to what the Chinese communists have done in the past, the defence ministry can have a grasp on it, and will consider the worse scenario,” he said.
“During the president’s overseas visit, the defence ministry has contingency plans for all moves” by China, Po added, declining to give details.
The United States has said there is no reason for China to react to Tsai’s trip, saying such transits are routine and have happened many times before.
China, which has condemned Tsai’s planned US stop over, has continued its military activities around Taiwan since August, though on a much reduced scale.
Taiwan rejects China’s sovereignty claims, saying on Taiwan’s people can decide their future.