Exposure to wildfire smoke may increase lung cancer patients' risk of dying from their disease, particularly among non-smokers, but the effect may be mitigated by certain cancer treatments, according to a large California study presented at a major medical meeting on Saturday.

Federal officials are set to start reviewing the social media accounts of visa applicants who plan to attend, work at or visit Harvard University for any signs of antisemitism, marking the latest development in a clash between the Trump administration and the Ivy League school.

The vetting will go beyond student applicants and includes faculty, employees, contractors, guest speakers and tourists, according to the cable seen by NBC News.