Claim: Donald Trump's golfing activities have already cost $100 million and are projected to cost $300 million.
Verdict: Partially True (60% confidence)
Explanation: According to Newsweek and HuffPost, Donald Trump's golfing activities have cost taxpayers over $100 million, confirming the first part of the claim. However, there is no direct evidence in the available sources supporting the projection that these costs will reach $300 million. The absence of confirmation for the projected future cost means the claim is rated partially true rather than correct.