Parts of script code removed by CKEditor

Hi,

When we insert a Twitter Widget script in a page, like:

<a class="twitter-timeline" href="https://twitter.com/twitter" data-widget-id="1234567890">Tweets by @Twitter</a>
<script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+"://platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs");</script>

And re-open the page, then the code becomes:

<a class="twitter-timeline" href="https://twitter.com/twitter">Tweets by @Twitter</a> <script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+"://platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs");</script>

How can we solve this? Is there a setting?