We would say "chimes in" but that is so pre-iCahn.
With utmost firmness I condemn the use of chemical weapons.
— Pope Francis (@Pontifex) September 3, 2013 [2]
It is unclear if his statement is an endorsement for the Obama "surgical strikes" although it is difficult to interpret it as such considering a day ago he also tweeted the following:
How much suffering, how much devastation, how much pain has the use of arms carried in its wake.
— Pope Francis (@Pontifex) September 2, 2013 [3]