Trump took a very dangerous step by changing his tactics and team at this point, especially since his moves on Monday only empowered his opponent and sowed the seeds of doubt regarding loyalty on his own side
Corrected polls show Trump had large lead over Clinton just before Lewandowski was fired
In contrast to the "pants on fire" claims by liberal and faux conservative journalists, there hasn't been a single poll in recent weeks before the firing of Corey Lewandowski that, once corrected for known bias, shows anything other than a Trump-Clinton tie, or even a Trump lead.
Polling data last week were staged by the uni-party so the GOPe could use the data as leverage to take control -- at least partially -- of Trump's campaign. This required the apparent use -- if we believe the "sourced" rumor mill -- of bad polling data to justify Corey Lewandowski's unceremonious firing. This was a campaign coup d'état on trumped-up charges. Nothing more, nothing less.
More evidence of the actual position Trump's campaign was in as of Monday comes from two new polls.