My family is deeply appreciative of all the love and generosity you have shown us during this past year. Thank you for all your continued support and prayers. We could not have made it this far without you - you've given us strength to carry on.

A post shared by Meghan McCain (@meghanmccain) on Aug 24, 2018 at 8:03am PDT

One of McCain's closest friends in the Senate, Sen. Lindsey Graham of South Carolina, said in a statement that Cindy McCain and their family were providing \"abiding love, care, and dedication\" for John McCain.

\"Cindy remains steadfast and is traveling every step of the way on this difficult journey with John. The love provided by Meghan and the McCain children to their father has been comforting to witness. The entire McCain clan is doing exactly what the McCains have done through generations — rise to the meet the challenge. In addition, John’s deeply loyal staff and devoted friends are pouring their hearts out and doing everything they can to make this burden bearable. John’s medical care providers represent the best of their profession,\" Graham said in a statement.

\"PHOTO:
MCT via Getty Images, FILE
PHOTO: Sen. Lindsey Graham, right, leans in for a private remark to Sen. John McCain during the start of a rally at the Crown Center in Fayetteville, North Carolina, Oct. 28, 2008.
>

Congressional leaders, members of Congress and lawmakers who worked closely with McCain also posted messages of support on social media.

Very sad to hear this morning’s update from the family of our dear friend @SenJohnMcCain. We are so fortunate to call him our friend and colleague. John, Cindy, and the entire McCain family are in our prayers at this incredibly difficult hour.

— Leader McConnell (@SenateMajLdr) August 24, 2018

John McCain personifies service to our country. The whole House is keeping John and his family in our prayers during this time.

— Paul Ryan (@SpeakerRyan) August 24, 2018

My thoughts and prayers are with Senator McCain and his family. https://t.co/cqHXdjJntj

— Chuck Schumer (@SenSchumer) August 24, 2018

John McCain's life has been one of service and sacrifice. His strength and resolve enabled him to endure 5.5 years as a prisoner of war, and to continue to serve his country for decades.

— Martha McSally (@RepMcSally) August 24, 2018

God bless and keep this wonderful man and his family @SenJohnMcCain

— Jeff Flake (@JeffFlake) August 24, 2018

.@SenJohnMcCain is an American hero. Angela and I send our prayers to Senator McCain, Cindy and the entire McCain family. Read my statement: pic.twitter.com/oxzKPKXucq

— Doug Ducey (@dougducey) August 24, 2018

No man this century better exemplifies honor, patriotism, service,
sacrifice, and country first than Senator John McCain. His heroism
inspires, his life shapes our character. I am blessed and humbled by
our friendship.

— Mitt Romney (@MittRomney) August 24, 2018

Prayers for @SenJohnMcCain and his family at this most trying time ???? May comfort and peace envelope them. May my friend sense appreciation for his inspiration to serve something greater than self ???????? - Sarah Palin pic.twitter.com/5KbI3IpUel

— Sarah Palin (@SarahPalinUSA) August 24, 2018

ABC News' Ali Rogin contributed to this report.

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