If all you want to do is grab onto anything that helps you win an argument today, then sure, the 26,000 peak the Dow just hit is yet another indication of Donald Trump's economic success. It's never been that high, and at least some of the current market rise seems tied to the reality of what the corporate tax rate cut is going to do to corporate after-tax earnings.
That's a more real and sustainable increase than momentary reactions to tangentially related items in the news, or the equivalent market drops when traders start panicking about something. That sort of thing usually corrects itself quickly. When stock prices are on the rise because corporate earnings are rising and likely to stay on the upswing, that's real and worth noting.