It's not the first time he's done this. You can read Thich Nhat Hanh's 2003 address to Congress here, in our archives. For more, check out Elephant's coverage, which includes a link for info on how to encourage Members of Congress to attend the retreat and lecture.
Bringing mindfulness to the US House of Representatives and Senate
Talk about "Creating a Mindful Society." Vietnamese Zen master and mindfulness proponent Thich Nhat Hanh — as Elephant Journal reports — will be "giving a lecture and leading an overnight mindfulness retreat in late October for Members of Congress, their family members and Congressional staff."