(CNN) – If former Florida Gov. Jeb Bush decides to seek the Republican presidential nomination in 2016, he'll have one major supporter at his side.
Former President George W. Bush, who's stepping back into the spotlight as his presidential library opens this week, says he thinks his younger brother should throw his hat into the ring.
"Well, big Jeb, you know, he's got a decision to make. And if I could make it for him, it'd be, 'run,' but I can't," he told CNN's chief national correspondent John King.
"And I don't know what he's going to do. He'd be a great candidate and a great president," he added.
According to a CNN/ORC International poll released late last month, 56% of Republicans have a favorable opinion of the former governor, with House Budget Committee Chairman Paul Ryan being the only potential 2016 GOP contender with higher marks.
Bush hasn't ruled out a possible GOP run and won't make a decision in the near future. Asked last month by CNN's Jake Tapper if he'll decide in 2014, Bush said "the only thing I've decided is I'm not going to think about it for 2013. It's just too far out for me personally."
He passed on running for the Republican presidential nomination in 2008 and 2012. Instead, he's filled the role of a party elder statesman since leaving office in January 2007 after two terms as governor.
While in town for a dedication ceremony for his brother's presidential library, Bush spoke Wednesday in front of the World Affairs Council in Dallas about the ongoing immigration debate, which is also the topic of his recently released book "Immigration Wars."
If Bush does decide to run, and were he to win the 2016 GOP nomination, he could face off in the general election against a member of another famous political family - Hillary Clinton.
Both Hillary Clinton and Jeb Bush will attend Thursday the George W. Bush Presidential Center dedication at Southern Methodist University.
– CNN's Paul Steinhauser and Ashley Killough contributed to this report.