He was trying to clean up the mess that the democrat congress made. Reagan just signed the bills. — second term — onset of Alzheimer’s
The U.S. Senate election, 1986 was an election for the United States Senate in the middle of Ronald Reagan’s second presidential term. The Republicans had to defend an unusually large number of freshman Senate incumbents who had been elected on President Ronald Reagan’s coattails in 1980. Democrats won a net of eight seats, defeating seven freshman incumbents and regaining control of the Senate for the first time since 1980. The party not controlling the presidency gained seats, as usually occurs in mid-term elections.
The United States House of Representatives election, 1986 was held on November 4, 1986, in the middle of President Ronald Reagan’s second term in office. As in most midterm elections, the President’s partyâin this case, the Republican Party â lost seats, with the Democratic Party gaining a net of five seats and cementing its majority. These results were not as dramatic as those in the Senate, where the Republicans lost control of the chamber to the Democrats. Notable freshmen include future House Speaker Dennis Hastert (R-IL).
This is what Trump is complaining about in the video you linked:
https://en.wikipedia.org/wiki/Tax_Reform_Act_of_1986