Sen. John McCain is remaining active despite his cancer diagnosis, spending the weekend hiking in Arizona.

McCain tweeted a photo of himself on a hike in Oak Creek, Ariz., with his friend Joe Harper on Sunday.

Enjoying Zebra Falls in beautiful Oak Creek, #Arizona today with my friend Joe Harper pic.twitter.com/4Gk0KR1oj8

— John McCain (@SenJohnMcCain) July 23, 2017

McCain also tweeted he would review measures to increase sanctions on Iran, Russia and North Korea.

Glad deal finally reached for sanctions on Russia, Iran & North Korea – I’m reviewing details closely to ensure strong, effective sanctions

— John McCain (@SenJohnMcCain) July 23, 2017

 McCain’s daughter Meghan tweeted a photo of her and her father hiking on Saturday.

Amazing hike with Dad @SenJohnMcCain this morning. Thank you all for your best wishes! pic.twitter.com/P9RR2v91HB

— Meghan McCain (@MeghanMcCain) July 22, 2017

 It was announced last week that the Republican senator was diagnosed with brain cancer.