Welcome to Sunday and the best of The Conversation.

As you may have heard, last week Donald Trump announced his third run for the presidency.

Our most-read story this week explores why Trump’s legal problems don’t disqualify him from the nation’s highest office – a question I have been asked frequently by family members who don’t usually follow politics.

Stefanie Lindquist, a professor of law and political science at Arizona State University, writes there are only “three requirements – natural-born citizenship, age and residency” set forth in the U.S. Constitution. What’s more, the Supreme Court decades ago blocked Congress from adding more.

“History is dotted with instances of candidates for federal office running – and even being elected – while in prison,” Lindquist writes.

So far, reaction to Trump’s announcement has been muted compared with 2015. Thomas Patterson, a professor of government and the press at Harvard’s Kennedy School of Government, tells media makers and consumers how to avoid falling under Trump’s thrall once again.

The World Cup opens in Qatar today. Many Americans won’t be rooting for the U.S. team, a reflection of the pull professional leagues in other countries have on U.S. soccer fans.

Today is Transgender Day of Remembrance. A professor of medicine and primary care doctor writes that the medical system is poorly equipped to meet the needs of gender-diverse patients.

This week we’ll bring you stories about the value of airline miles, how air pollution affects mental health and what you can learn from the cover of a book.