During the campaign, he twice restructured his team’s leadership, axing his original campaign manager Corey Lewandowski in June and Lewandowski’s successor Paul Manafort in August. As president, the firings have been different in nature, with the two highest profile being Michael Flynn, removed from his position as national security adviser, and Jim Comey, ousted as director of the FBI. He’s fired other people, too — acting attorney general Sally Yates, for example — but Flynn and Comey generated the most media attention.

So: Does it do any good? When Trump fires people, does it result in any significant change to his fortunes, as measured in the polls?

The thousand-foot view of that question looks like this, using the daily polling average from the campaign calculated by RealClearPolitics and the daily Gallup approval rating.

It’s a bit hard to tell what’s going on from that distance, though, so we also pulled out four-week periods around each firing. The graphs below show a week before the firing (in lighter color) and three weeks after, allowing us to see the trends. All figures are relative to polling on the day of the respective firing.

Lewandowski and Manafort look similar: a slow, briefly interrupted rise in Trump’s polling after the firing. But each also has the same caveat. In each case, those poll numbers were already rising. Trump fired both of them shortly after a low point in the candidate’s polling, meaning that, in each case, he was already on the upswing. After the firings, those upswings generally continued.

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In office, the picture is different. The Flynn firing came as Trump’s daily job approval numbers (actually an average of the preceding three days) turned around. The Comey firing came as Trump’s approval numbers were already sinking — but, in the past week or so, those numbers have turned around in Gallup’s polling.

Comey was a different sort of firing, of course, the ouster by Trump of someone who wasn’t an ally. Gallup polling suggests that any negative effect from that firing was likely limited in its extent.

That first graph, though, brings us back to a point we made earlier. The range of movement Trump’s seen in polling has been limited, both before and after the election.