A Chinese mainland spokesman called on political parties in Taiwan to stand on the right side of history in response to remarks made by Eric Chu Li-luan, chairman of the Chinese Kuomintang party, during his trip to the United States.

Chu reiterated the KMT's historic ties to the US during a visit to the Hoover Institution at Stanford University in California last week, the KMT said in a statement issued on Monday.

He also said the party continues to fight against communism and compete with the Communist Party of China over values and political systems, according to the statement.

"Taiwan is part of China, and cross-Straits affairs are a family matter concerning compatriots on both sides of the Taiwan Straits. It should be handled through consultation with family members rather than outsiders," Ma Xiaoguang, spokesman for the Taiwan Affairs Office of the State Council, said in a statement on Thursday.

The CPC is a political party whose mission is to seek happiness for the Chinese people and rejuvenation for the nation, and it has made achievements that have been globally acknowledged, Ma said.

The current situation across the Straits is complex and grim, and relations are growing increasingly tense, he said.

Any political party, organization or individual on the island that is committed to developing cross-Straits relations and maintaining peace and stability in the Straits should keep a clear head, view matters from a long-term perspective and stand on the right side of history, he added.