Saying "religious freedom in America has suffered years of unprecedented erosion," the US Catholic bishops have posted an online letter for Catholics to send to President Donald Trump urging him to sign an executive order promoting religious freedom.

The letter says the president can "restore the federal government's respect for the religious freedom of individuals and organisations" with an executive order that establishes a "government-wide initiative to respect religious freedom." Individuals can sign the letter and hit a link to submit it to Trump.