Here’s some news for Donald Trump: You’re not president yet [“Taiwan talk just ‘courtesy call,’ ” News, Dec. 5].

While President Barack Obama has done everything he can to ensure a smooth transition of power, Citizen Trump has done what he can to undermine the president’s last two months in office.

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Trump’s talk with Taiwan and his tweets saying he may reverse course on our improved relationship with Cuba are but two of the things he has done to imperil any rapport our nation has with China and Cuba. Either Trump doesn’t understand the impact of his actions, or there is malicious intent.

Arnold Holtzman, Plainview