President Donald Trump issued a statement wishing Muslims around the world a "joyful" Ramadan.

Trump's statement comes nearly a week after he kicked off his maiden overseas tour in Saudi Arabia.

"During this month of Ramadan, let us be resolved to spare no measure so that we may ensure that future generations will be free of this scourge and able to worship and commune in peace," said Trump, whose revised travel ban on half a dozen Muslim-majority countries was once again rejected by a US court this week on grounds of religious discrimination.

"At its core, the spirit of Ramadan strengthens awareness of our shared obligation to reject violence, to pursue peace, and to give to those in need who are suffering from poverty or conflict," he said.

During Ramadan, Muslims around the world abstain from eating, drinking, smoking and having sex from dawn to dusk. The month is sacred to Muslims because tradition says it marks the period when the Koran was revealed to the Prophet Mohammed.

The presidential statement concluded by saying, "I extend my best wishes to Muslims everywhere for a blessed month as you observe the Ramadan traditions of charity, fasting, and prayer. May God bless you and your families."