There is just zero evidence for that. Reagan brought taxes down from higher rates, and between 1981 and 1989, individual income taxes went up by 13%, inflation adjusted, and that includes several tax increases by Reagan post 1981. Clinton raised rates, which if we're at the peak should show tax revenue declines, but what we saw instead was revenue exploded versus prior periods, up by 66%, or
5X more than following the Reagan tax cuts. So, what happened with the Bush II tax cuts? Revenue collapsed by about 20% in the initial years, and even at the peak of the biggest bubble in generations, FY 2007 (prior to the collapse), individual tax revenues failed to EVER match receipts that peaked in 2000. It took until 2014, two years after the Bush II tax cuts expired on the upper income people to match receipts last seen in 2000 - 14 years of economic growth, zero increase in revenues.
So we're not anywhere close to the top of the Laffer Curve. There isn't an economist I've seen that thinks we are, and the argument at this point is just a lie to sell tax cuts to people who may be concerned about deficits, but it's still a lie, and the people pushing it know it's a lie. If you believe it I urge you to look at the data.
https://www.whitehouse.gov/omb/historical-tables/
The GOP just pushed through tax cuts without a single Democratic vote, and given that spending cuts REDUCE deficits, they can cut spending at any time, many times with bare majorities in the House and Senate. They haven't. Spending has in fact increased, which it did under Reagan, and under Bush II. So you can believe what the GOP SAY or what they DO, and what they do is cut taxes, increase spending, blow up the deficit, and blame it on liberals...
LOL, OK.