The following is the text for the psalm.
1The unjust conceives wickedness inside his heart, for there is no fear of god before his eyes.
2He is unwilling to see his sins forgiven, or to hate them.
3The words of his mouth are iniquity and deceit; he is unwilling to do good.
4He devises mischief on his bed; he walks in a way that is not good, that he may do evil.
5Yahvah, your mercy is in the skies; and your faithfulness reaches to the universe.
6Your righteousness is like the mountain of god; your judgments are like a great deep; Yahvah, you preserve man and animal.
7How abundant is your lovingkindness, god. Therefore the sons of men take refuge under the shadow of your wings.
8They will flourish with the richness of your house; and you will give them to drink of the pleasant water of your spring.
9For with you is the fountain of life; in your light, we will see light.
10Continue your lovingkindness to those who know you, and your righteousness to the upright in heart.
11Do not let the foot of pride come against me, and do not let the hand of the wicked remove me.
12For there, the workers of iniquity will fall; they will be cast down, and will not be able to rise.
Air Force One touched down about an hour ahead of the theoretical time for the Psalm. The president then had a helicopter ride into the city where he would remain for the rest of the G-20 summit.
The very close timing to the theoretical time for the Psalm is interesting.
The specific match is in vs. 4, where the traveling nature of the President's arrive matched this arrival in London.
Much of the rest of the Psalm echos what eventually happens with Paraoh and the Israelites when the leave Egypt. Note also that "man" as a prophetic symbol in the Bible's algebra appies to the United States.