For those interested in further reading of what President Reagan had to say about Challenger in his diaries:
Tuesday, January 28 
A day we’ll remember for the rest of our lives. Started off with a staff meeting & then a session with the Cong. leadership of both parties. Had a go around with Tip—think I came out pretty good…..
Then I was getting a briefing for a meeting I was to have with network anchors—an advance on the St. of the Union address scheduled for tonight. In came Poindexter & the V.P. with the news the shuttle Challenger had blown up on takeoff. We all then headed for a TV & saw the explosion re-played. From then on there was the only subject—the death of the 6 crew & 1 passenger—Mrs. McAuliffe, the teacher who had won the right to make the flight. There is no way to describe our shock & horror. We cancelled—I should say postponed the St. of the Union address til next week. Cong. closed down for the day.
Wednesday, January 29
A memorial service has been set up for Friday in Houston the 7 heroes who lost their lives yesterday. Incidentally, phone calls & wires poured in with nice words about my 5 min. speech yesterday on TV. Now this afternoon I had a tougher job—phone calls to the families of the 7. All of them asked that we continue the space program—that’s what their loved ones would have wanted.
Friday, January 31
At 8:45 on way to Andrews. A.F. 1 taking us to Houston for memorial service to Astronauts. Met with families a NASA Center—an emotional time. Then out to join some 14,000 people which included all the employees, family etc. of the entire space center. Nancy & I sat between Mrs. Scobee—wife of leader of the Challenger crew & Mrs. Smith, widow of one of the crew. It was a hard time for all the families & all we could do was hug them & try to hold back our tears. When it was over we flew to Andrews & then helicoptered to Camp D.
Wednesday, February 12 [at the Calif. ranch]
Then a call came re the Shuttle tragedy. Apparently the representative of the company that makes the rocket boosters refused to sign the certificate for launch & someone in Florida got 2 Nasa officials to sign off without telling them of the negative report on the booster.
Monday, March 10—A beautiful sunshiny day
received advance report that two bodies of Challenger astronauts had been found off Florida.
Monday, June 9
The usual issues briefing lunch & then a report or I should say the report of the Rogers commission on the Challenger tragedy. They did a great job for 120 days at no cost to the govt.
Tuesday, July 29
Sen. Jake Garn came in to see me about the 4th Shuttle to replace the Challenger. The problem is money & O.M.B. has proposed that we delay till 1988. This will set back our plans for a Space Station etc. The alternative is to put up a half Bil. in ’77 ['87] budget & start then. That’s what Jake wants. From him I went in to an NSC meeting on the same subject. Defense, State, Transportation, Justice & NASA go for the ’87 start. The problem is now mine & it’s a tough one. I want to do the ’87 bit myself but we face a $220 Bil. deficit in ’87 because Congress won’t give us the spending cuts we’ve asked for.
Wednesday, January 28 
Then I did a live TV broadcast to all the NASA stations—anniversary of Challenger tragedy.